L’Autochrome Lumi\u00e8re \u2014 Premier proc\u00e9d\u00e9 photographique couleur<\/title>\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:wght@400;500;600&family=EB+Garamond:ital,wght@0,400;0,600;1,400&display=swap\" rel=\"stylesheet\">\n<style>\n:root {\n --c-bg: #ffffff;\n --c-surface: #ffffff;\n --c-border: #e2ddd6;\n --c-border-md: #cec8be;\n --c-text: #1a1714;\n --c-muted: #6b6560;\n --c-faint: #9c958d;\n --c-accent: #2c4a3e;\n --c-accent-lt: #e8f0eb;\n --c-warm: #f5f0e8;\n --c-amber: #7a4e0a;\n --c-amber-lt: #fdf0d5;\n --c-sepia: #5a3a1a;\n --c-sepia-lt: #f5ece0;\n --font-body: 'EB Garamond', Georgia, serif;\n --font-ui: 'DM Sans', system-ui, sans-serif;\n --r: 10px;\n}\n*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n\/* \u2500\u2500 Wrapper \u2500\u2500 *\/\n.ac {\n background: var(--c-bg);\n border: 1px solid var(--c-border);\n border-radius: var(--r);\n padding: 22px 16px 28px;\n font-family: var(--font-ui);\n color: var(--c-text);\n max-width: 100%;\n}\n\n\/* \u2500\u2500 Hero \u2500\u2500 *\/\n.ac-hero {\n background: linear-gradient(135deg, #2c1a0a 0%, #5a3a1a 60%, #7a5a2a 100%);\n border-radius: 8px;\n padding: 24px 20px 22px;\n margin-bottom: 20px;\n position: relative;\n overflow: hidden;\n}\n.ac-hero::before {\n content: '';\n position: absolute;\n bottom: -50px; 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}\n\n\/* \u2500\u2500 Collections card \u2500\u2500 *\/\n.collections {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.coll-head {\n background: #f2ede6;\n padding: 8px 14px;\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted);\n border-bottom: 1px solid var(--c-border-md);\n}\n.coll-row {\n display: flex; align-items: flex-start; gap: 12px;\n padding: 11px 14px;\n border-bottom: 1px solid var(--c-border);\n}\n.coll-row:last-child { border-bottom: none; }\n.coll-num {\n font-family: var(--font-body);\n font-size: 18px; font-weight: 600;\n color: var(--c-sepia); flex-shrink: 0;\n min-width: 72px;\n}\n.coll-place { font-size: 13px; font-weight: 600; color: var(--c-text); }\n.coll-detail { font-size: 12px; color: var(--c-muted); margin-top: 2px; line-height: 1.4; }\n\n\/* \u2500\u2500 Sep \u2500\u2500 *\/\n.sep { border-top: 1px solid var(--c-border); margin: 14px 0; }\n\n\/* \u2500\u2500 Footer \u2500\u2500 *\/\n.ac-footer {\n margin-top: 20px; padding-top: 16px;\n border-top: 1px solid var(--c-border);\n display: flex; flex-wrap: wrap; gap: 8px;\n}\n.fbadge {\n font-size: 11px; font-weight: 500;\n padding: 4px 12px; border-radius: 20px;\n border: 1px solid var(--c-border-md);\n color: var(--c-muted);\n}\n.fbadge.sepia {\n background: var(--c-sepia-lt);\n color: var(--c-sepia);\n border-color: #d4b896;\n}\n<\/style>\n<\/head>\n<body>\n\n<div class=\"ac\">\n\n \n <div class=\"ac-hero\">\n <div class=\"ac-kicker\">Histoire de la photographie<\/div>\n <h1>L’Autochrome Lumi\u00e8re<\/h1>\n <div class=\"ac-hero-sub\">Le premier proc\u00e9d\u00e9 photographique couleur accessible au grand public \u2014 invent\u00e9 \u00e0 Lyon \u00e0 partir de f\u00e9cule de pomme de terre<\/div>\n <div class=\"hero-tags\">\n <span class=\"htag\">1907<\/span>\n <span class=\"htag\">Lyon, France<\/span>\n <span class=\"htag\">Couleur additive<\/span>\n <span class=\"htag\">Plaque de verre<\/span>\n <span class=\"htag\">Auguste & Louis Lumi\u00e8re<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"highlight\">\n <strong>Une id\u00e9e improbable :<\/strong> recouvrir une plaque de verre de millions de grains de f\u00e9cule de pomme de terre color\u00e9s en rouge, vert et bleu \u2014 chaque grain mesurant 10 \u00e0 15 microns, invisibles \u00e0 l’\u0153il nu. Derri\u00e8re cette couche de f\u00e9cule, une \u00e9mulsion argentique classique. La lumi\u00e8re traverse les grains color\u00e9s, impressionne la g\u00e9latine, et l’image qui en r\u00e9sulte est en couleurs. C’est le principe de la <strong>synth\u00e8se additive<\/strong>, le m\u00eame fondement que nos \u00e9crans num\u00e9riques aujourd’hui.\n <\/div>\n\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"https:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/autochrome-lyon-pont_du_change-quai_de_Saone.webp\"\n alt=\"Pont du Change, quai de Sa\u00f4ne. Plaque autochrome Lumi\u00e8re, 1935\"\n style=\"width: 100%; height: auto; display: block;\"\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n Pont du Change, quai de Sa\u00f4ne. Plaque autochrome Lumi\u00e8re, 1935. Collection Institut Lumi\u00e8re\n <\/div>\n\n<\/div>\n\n \n <div class=\"sections\">\n\n \n <div class=\"sec open\" id=\"s0\">\n <button class=\"sec-trigger\" onclick=\"toggle('s0')\">\n <div class=\"sec-icon\">\ud83c\udfdb<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Histoire & contexte<\/span>\n <span class=\"sec-sub\">Des fr\u00e8res Lumi\u00e8re \u00e0 la conqu\u00eate mondiale de la couleur<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">Auguste et Louis Lumi\u00e8re sont connus dans le monde entier pour avoir invent\u00e9 le cin\u00e9matographe en 1895. Mais leur \u0153uvre scientifique est bien plus vaste. C’est dans leurs usines lyonnaises, \u00e0 partir de 1891, qu’ils d\u00e9veloppent en parall\u00e8le ce qui deviendra le premier proc\u00e9d\u00e9 couleur industriellement viable de l’histoire.<\/p>\n\n <div class=\"slabel\">Chronologie<\/div>\n <div class=\"timeline\">\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1891\u20131903<\/div>\n <div class=\"tl-text\">Les fr\u00e8res Lumi\u00e8re commencent leurs recherches sur la photographie en couleurs. Ils explorent plusieurs voies avant de s’orienter vers le principe de la mosa\u00efque de filtres color\u00e9s.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1904<\/div>\n <div class=\"tl-text\">D\u00e9p\u00f4t du brevet de l’autochrome. La technique est au point : granules de f\u00e9cule teint\u00e9s, poudre de charbon pour combler les interstices, vernis de protection, \u00e9mulsion panchromatique.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot gold\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year gold\">10 juin 1907<\/div>\n <div class=\"tl-text\"><strong>Pr\u00e9sentation officielle \u00e0 Paris<\/strong> dans les salons de L’Illustration. En quelques semaines, les commandes affluent du monde entier. C’est une r\u00e9volution.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot gold\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year gold\">1910\u20131925<\/div>\n <div class=\"tl-text\">Apog\u00e9e de l’autochrome. Les usines Lumi\u00e8re \u00e0 Lyon produisent <strong>jusqu’\u00e0 6 000 plaques par jour<\/strong>. L\u00e9on Gimpel, Heinrich K\u00fchn, Alfred Stieglitz et les Pictorialistes du monde entier l’adoptent.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1909\u20131913<\/div>\n <div class=\"tl-text\">Albert Kahn, banquier philanthrope, finance les <em>Archives de la Plan\u00e8te<\/em> : une mission mondiale de documentation en autochrome. R\u00e9sultat : 72 000 plaques repr\u00e9sentant 50 pays.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1935<\/div>\n <div class=\"tl-text\">Lancement du <strong>Kodachrome<\/strong> par Kodak \u2014 film couleur moderne sur support souple. L’autochrome est progressivement abandonn\u00e9. Il aura domin\u00e9 la couleur photographique pendant pr\u00e8s de 30 ans.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Les fr\u00e8res Lumi\u00e8re :<\/strong> Auguste (1862\u20131954) \u00e9tait davantage le chimiste, Louis (1864\u20131948) l’ing\u00e9nieur et l’inventeur. L’autochrome est souvent attribu\u00e9 \u00e0 Louis, mais les deux fr\u00e8res ont travaill\u00e9 conjointement sur l’ensemble du proc\u00e9d\u00e9. Leur usine \u00e0 Lyon-Monplaisir employait plusieurs milliers d’ouvriers au d\u00e9but du XXe si\u00e8cle.<\/div>\n\n <div class=\"slabel\">Le contexte scientifique<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd2c<\/div>\n <div><div class=\"pkey\">James Clerk Maxwell, 1861<\/div><div class=\"pval\">Premi\u00e8re photographie couleur par synth\u00e8se additive <em>\u2014 trois n\u00e9gatifs noir et blanc pris \u00e0 travers des filtres rouge, vert, bleu, projet\u00e9s superpos\u00e9s<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udfa8<\/div>\n <div><div class=\"pkey\">Charles Cros & Louis Ducos du Hauron, 1869<\/div><div class=\"pval\">Premiers brevets fran\u00e7ais sur la photographie couleur <em>\u2014 principes th\u00e9oriques de la trichromie soustractive et additive<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udca1<\/div>\n <div><div class=\"pkey\">L’apport des Lumi\u00e8re<\/div><div class=\"pval\">Industrialiser le proc\u00e9d\u00e9 : passer d’une technique de laboratoire \u00e0 une plaque vendue en bo\u00eete, utilisable par n’importe quel photographe amateur avec un appareil ordinaire<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"\nhttps:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/Two_women_holding_a_sign_that_readsEaster.webp\"\n alt=\"Autochrome - Two women holding a sign that readsEaster Holidays!\"\n style=\"width: 100%; height: auto; display: block;\"\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n Autochrome – Two women holding a sign that readsEaster Holidays! Take a Kodak with you Prices from 5\n <\/div>\n<\/div>\n\n \n <div class=\"sec\" id=\"s1\">\n <button class=\"sec-trigger\" onclick=\"toggle('s1')\">\n <div class=\"sec-icon\">\ud83d\udd34<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Le principe optique<\/span>\n <span class=\"sec-sub\">La mosa\u00efque additive \u2014 anc\u00eatre du pixel<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’autochrome fonctionne sur le principe de la <strong>synth\u00e8se additive des couleurs<\/strong> \u2014 le m\u00eame principe que les \u00e9crans LCD ou OLED que vous utilisez aujourd’hui. Chaque granule de f\u00e9cule est un minuscule filtre color\u00e9. L’\u0153il humain, incapable de distinguer des points s\u00e9par\u00e9s de moins de 0,1 mm \u00e0 distance normale, fusionne ces millions de petites taches color\u00e9es en une image continue.<\/p>\n\n <div class=\"slabel\">La mosa\u00efque de granules \u2014 sch\u00e9ma<\/div>\n <div class=\"mosaic-wrap\">\n <svg viewBox=\"0 0 340 220\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"font-family:var(--font-ui)\">\n \n <rect width=\"340\" height=\"220\" fill=\"#f5f0e8\"\/>\n\n \n <text x=\"170\" y=\"18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#6b6560\" font-weight=\"600\" letter-spacing=\".05em\" text-decoration=\"none\">COUPE TRANSVERSALE D’UNE PLAQUE AUTOCHROME<\/text>\n\n \n <rect x=\"20\" y=\"28\" width=\"300\" height=\"24\" fill=\"#b0c8d8\" opacity=\".5\" rx=\"2\"\/>\n <text x=\"326\" y=\"44\" font-size=\"9\" fill=\"#6b6560\">Verre<\/text>\n\n \n <rect x=\"20\" y=\"52\" width=\"300\" height=\"8\" fill=\"#e8d8a0\" opacity=\".7\" rx=\"1\"\/>\n <text x=\"326\" y=\"59\" font-size=\"9\" fill=\"#6b6560\">Vernis<\/text>\n\n \n <rect x=\"20\" y=\"60\" width=\"300\" height=\"20\" fill=\"#c8c0a8\" opacity=\".6\" rx=\"1\"\/>\n <text x=\"326\" y=\"73\" font-size=\"9\" fill=\"#6b6560\">\u00c9mulsion<\/text>\n\n \n \n <ellipse cx=\"30\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"44\" cy=\"91\" rx=\"6\" ry=\"6\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"57\" cy=\"94\" rx=\"8\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"70\" cy=\"92\" rx=\"6\" ry=\"6\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"83\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"96\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"108\" cy=\"94\" rx=\"7\" ry=\"6\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"121\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"133\" cy=\"93\" rx=\"7\" ry=\"6\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"146\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"159\" cy=\"94\" rx=\"8\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"172\" cy=\"92\" rx=\"6\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"184\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"197\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"210\" cy=\"94\" rx=\"7\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"222\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"235\" cy=\"93\" rx=\"8\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"248\" cy=\"91\" rx=\"6\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"260\" cy=\"94\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"273\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"286\" cy=\"93\" rx=\"7\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"299\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"311\" cy=\"94\" rx=\"7\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n\n \n <ellipse cx=\"37\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"51\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"64\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"78\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"91\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"115\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"127\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"152\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"167\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"190\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"204\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"228\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"243\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"267\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"280\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"305\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n\n \n <text x=\"170\" y=\"112\" text-anchor=\"middle\" font-size=\"9\" fill=\"#6b6560\" font-style=\"italic\">\u2248 4 millions de granules par cm\u00b2 \u2014 diam\u00e8tre moyen 10\u201315 \u00b5m<\/text>\n\n \n <rect x=\"20\" y=\"116\" width=\"300\" height=\"7\" fill=\"#e8d8a0\" opacity=\".5\" rx=\"1\"\/>\n <text x=\"326\" y=\"122\" font-size=\"9\" fill=\"#6b6560\">Vernis<\/text>\n\n \n <line x1=\"20\" y1=\"136\" x2=\"320\" y2=\"136\" stroke=\"#cec8be\" stroke-width=\"0.5\" stroke-dasharray=\"4,3\"\/>\n\n \n <text x=\"170\" y=\"152\" text-anchor=\"middle\" font-size=\"10\" fill=\"#6b6560\" font-weight=\"600\" letter-spacing=\".04em\">SYNTH\u00c8SE ADDITIVE \u2014 FUSION DES COULEURS<\/text>\n\n \n <circle cx=\"130\" cy=\"185\" r=\"22\" fill=\"#c83030\" opacity=\".55\"\/>\n <circle cx=\"150\" cy=\"185\" r=\"22\" fill=\"#2a7a2a\" opacity=\".55\"\/>\n <circle cx=\"140\" cy=\"169\" r=\"22\" fill=\"#2a3a9a\" opacity=\".55\"\/>\n \n <circle cx=\"140\" cy=\"180\" r=\"9\" fill=\"#f5f0e8\" opacity=\".9\"\/>\n <text x=\"140\" y=\"183\" text-anchor=\"middle\" font-size=\"8\" fill=\"#5a3a1a\" font-weight=\"600\">blanc<\/text>\n\n \n <line x1=\"176\" y1=\"180\" x2=\"200\" y2=\"180\" stroke=\"#9c958d\" stroke-width=\"1.2\" marker-end=\"url(#arr)\"\/>\n <defs>\n <marker id=\"arr\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"3\" orient=\"auto\">\n <path d=\"M0,0 L6,3 L0,6 Z\" fill=\"#9c958d\"\/>\n <\/marker>\n <\/defs>\n\n \n <rect x=\"204\" y=\"162\" width=\"100\" height=\"36\" rx=\"3\" fill=\"#8a9a7a\" opacity=\".7\"\/>\n <rect x=\"204\" y=\"162\" width=\"30\" height=\"36\" rx=\"0\" fill=\"#5a7a4a\" opacity=\".8\"\/>\n <rect x=\"264\" y=\"162\" width=\"40\" height=\"36\" rx=\"0\" fill=\"#6a8a8a\" opacity=\".6\"\/>\n <ellipse cx=\"235\" cy=\"180\" rx=\"12\" ry=\"10\" fill=\"#c8a060\" opacity=\".7\"\/>\n <text x=\"254\" y=\"208\" text-anchor=\"middle\" font-size=\"9\" fill=\"#6b6560\" font-style=\"italic\">Image per\u00e7ue \u00e0 distance<\/text>\n\n \n <text x=\"117\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#c83030\" font-weight=\"600\">Rouge<\/text>\n <text x=\"140\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#2a3a9a\" font-weight=\"600\">Bleu<\/text>\n <text x=\"163\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#2a7a2a\" font-weight=\"600\">Vert<\/text>\n <\/svg>\n <\/div>\n\n <div class=\"slabel\">Comment l’\u0153il reconstitue les couleurs<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">La lumi\u00e8re blanche du sujet photographi\u00e9 traverse d’abord la vitre de verre, puis la couche de granules de f\u00e9cule color\u00e9s.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Chaque granule rouge ne laisse passer que le rouge, chaque granule vert que le vert, chaque granule bleu que le bleu. <strong>Environ 70% de la lumi\u00e8re est absorb\u00e9e<\/strong> par les filtres.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">La lumi\u00e8re filtr\u00e9e impressionne l’<strong>\u00e9mulsion argentique panchromatique<\/strong> selon son intensit\u00e9. Apr\u00e8s d\u00e9veloppement invers\u00e9 (proc\u00e9d\u00e9 positif direct), les zones bien expos\u00e9es deviennent transparentes.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">\u00c0 la visualisation, la lumi\u00e8re traverse \u00e0 nouveau les granules. L’\u0153il, situ\u00e9 \u00e0 distance normale, est <strong>incapable de distinguer les points individuels<\/strong> (r\u00e9solution de l’\u0153il ~0,1 mm \u00e0 25 cm). Il fusionne les couleurs en teinte continue.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Exactement comme un \u00e9cran LCD :<\/strong> un pixel d’\u00e9cran est compos\u00e9 de trois sous-pixels rouge, vert, bleu juxtapos\u00e9s. L’\u0153il les fusionne en une couleur unique. Les granules d’autochrome fonctionnent sur le m\u00eame principe, avec 120 ans d’avance \u2014 sauf que les filtres sont al\u00e9atoirement distribu\u00e9s plut\u00f4t qu’en grille r\u00e9guli\u00e8re.<\/div>\n\n <div class=\"slabel\">R\u00e9partition des granules<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd34<\/div>\n <div><div class=\"pkey\">Rouge-orange<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule de pomme de terre teint\u00e9e \u00e0 l’alizarine ou \u00e0 l’\u00e9rythrosine<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udfe2<\/div>\n <div><div class=\"pkey\">Vert<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule teint\u00e9e au vert malachite ou \u00e0 la tartrazine<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd35<\/div>\n <div><div class=\"pkey\">Bleu-violet<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule teint\u00e9e \u00e0 l’indigo ou au bleu d’aniline<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\u26ab<\/div>\n <div><div class=\"pkey\">Charbon de bois fin<\/div><div class=\"pval\">Comble les interstices entre les granules pour \u00e9viter les fuites de lumi\u00e8re blanche <em>\u2014 sans lui, les blancs seraient parasit\u00e9s<\/em><\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s2\">\n <button class=\"sec-trigger\" onclick=\"toggle('s2')\">\n <div class=\"sec-icon\">\ud83c\udfed<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Fabrication & prise de vue<\/span>\n <span class=\"sec-sub\">De la plaque vierge \u00e0 l’image couleur<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">La fabrication d’une plaque autochrome est un processus industriel complexe qui requiert une pr\u00e9cision extr\u00eame. La moindre irr\u00e9gularit\u00e9 dans la distribution des granules ou l’\u00e9paisseur de l’\u00e9mulsion se traduit directement par un d\u00e9faut de rendu chromatique.<\/p>\n\n <div class=\"slabel\">Fabrication en usine \u2014 les couches de la plaque<\/div>\n <div class=\"layers\">\n <div class=\"layers-head\">Structure d’une plaque autochrome (de bas en haut)<\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">1<\/div>\n <div class=\"layer-bar\" style=\"background:#b0c8d8\"><\/div>\n <div>\n <div class=\"layer-title\">Plaque de verre<\/div>\n <div class=\"layer-detail\">Support rigide, 9\u00d712 cm standard. Le verre est nettoy\u00e9 et d\u00e9poli l\u00e9g\u00e8rement pour favoriser l’adh\u00e9rence.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">2<\/div>\n <div class=\"layer-bar\" style=\"background:#e8d0a0\"><\/div>\n <div>\n <div class=\"layer-title\">Vernis adh\u00e9sif<\/div>\n <div class=\"layer-detail\">Fine couche collante qui va retenir les granules de f\u00e9cule lors du saupoudrage.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">3<\/div>\n <div class=\"layer-bar\" style=\"background:linear-gradient(90deg,#c83030 33%,#2a7a2a 66%,#2a3a9a 100%)\"><\/div>\n <div>\n <div class=\"layer-title\">Granules de f\u00e9cule color\u00e9s<\/div>\n <div class=\"layer-detail\">~4 millions\/cm\u00b2 saupoudr\u00e9s al\u00e9atoirement, lamin\u00e9s sous presse, puis rempli des interstices au charbon de bois fin. Vernis de protection appliqu\u00e9 par-dessus.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">4<\/div>\n <div class=\"layer-bar\" style=\"background:#c8c0a8\"><\/div>\n <div>\n <div class=\"layer-title\">\u00c9mulsion panchromatique<\/div>\n <div class=\"layer-detail\">G\u00e9latine-bromure d’argent sensible \u00e0 toutes les longueurs d’onde du visible. Couch\u00e9e sur les granules vernis. C’est l’\u00e2me argentique de la plaque.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">5<\/div>\n <div class=\"layer-bar\" style=\"background:#e8d8a0\"><\/div>\n <div>\n <div class=\"layer-title\">Vernis de protection final<\/div>\n <div class=\"layer-detail\">Prot\u00e8ge l’\u00e9mulsion des chocs et de l’humidit\u00e9. La plaque est vendue en bo\u00eete de 12, pr\u00eate \u00e0 l’emploi.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">La prise de vue<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">La plaque est charg\u00e9e dans la chambre photographique <strong>c\u00f4t\u00e9 verre vers l’objectif<\/strong> \u2014 la lumi\u00e8re doit traverser les granules avant d’atteindre l’\u00e9mulsion.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Un filtre jaune-orang\u00e9 est plac\u00e9 devant l’objectif pour <strong>corriger la sensibilit\u00e9 excessive du bleu-violet<\/strong> des \u00e9mulsions de l’\u00e9poque \u2014 sans lui, les ciels br\u00fblent et les carnations sont fauss\u00e9es.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\"><strong>Temps de pose longs :<\/strong> 1 \u00e0 4 secondes en pleine lumi\u00e8re d’\u00e9t\u00e9, plusieurs minutes \u00e0 l’ombre ou en int\u00e9rieur. Les 70% de lumi\u00e8re absorb\u00e9s par les granules imposent ces poses longues \u2014 les sujets doivent rester immobiles.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">Le d\u00e9veloppement suit un <strong>proc\u00e9d\u00e9 invers\u00e9 (r\u00e9version)<\/strong> : l’image latente n\u00e9gative est d’abord d\u00e9velopp\u00e9e, puis blanchie chimiquement, puis re-expos\u00e9e \u00e0 la lumi\u00e8re et re-d\u00e9velopp\u00e9e pour obtenir un positif direct sur la plaque.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">5<\/div>\n <div class=\"stxt\">La plaque termin\u00e9e est <strong>observ\u00e9e en transparence<\/strong> devant une source lumineuse ou projet\u00e9e sur \u00e9cran. Elle ne supporte pas d’\u00eatre dupliqu\u00e9e \u2014 chaque autochrome est unique.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"warn\"><strong>Chaque plaque est une pi\u00e8ce unique et irrempla\u00e7able.<\/strong> Contrairement au n\u00e9gatif argentique qui permet des tirages multiples, l’autochrome ne peut pas \u00eatre copi\u00e9 fid\u00e8lement. C’est \u00e0 la fois sa fragilit\u00e9 et sa valeur artistique.<\/div>\n\n <div class=\"tip\"><strong>Le filtre jaune-orang\u00e9 :<\/strong> appel\u00e9 filtre de correction ortho ou pan, il compensait le d\u00e9ficit de sensibilit\u00e9 au rouge des \u00e9mulsions orthochromatiques de l’\u00e9poque. Sans lui, les roses et les rouges ressortaient trop sombres, les ciels trop clairs. Son usage \u00e9tait syst\u00e9matique chez les photographes autochromes exp\u00e9riment\u00e9s.<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s3\">\n <button class=\"sec-trigger\" onclick=\"toggle('s3')\">\n <div class=\"sec-icon\">\ud83c\udfa8<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">L’esth\u00e9tique autochrome<\/span>\n <span class=\"sec-sub\">Une palette douce, lumineuse, presque pictorialiste<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’esth\u00e9tique autochrome est imm\u00e9diatement reconnaissable. Les couleurs sont douces, l\u00e9g\u00e8rement voil\u00e9es, avec une qualit\u00e9 lumineuse que les photographes de l’\u00e9poque comparaient aux vitraux gothiques ou aux toiles des Impressionnistes et Pointillistes. Cette palette particuli\u00e8re tient \u00e0 la physique m\u00eame du proc\u00e9d\u00e9.<\/p>\n\n <div class=\"slabel\">La palette caract\u00e9ristique<\/div>\n <div class=\"palette\">\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#2a4a30\"><\/span>\n <div><div class=\"pal-name\">Verts profonds et soutenus<\/div><div class=\"pal-desc\">La chlorophylle des feuillages r\u00e9agit particuli\u00e8rement bien aux granules verts \u2014 les jardins et les v\u00e9g\u00e9taux sont souvent les sujets les plus r\u00e9ussis<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#c8a070\"><\/span>\n <div><div class=\"pal-name\">Chairs chaudes et lumineuses<\/div><div class=\"pal-desc\">Les portraits en autochrome ont une qualit\u00e9 de peau dor\u00e9e et douce, tr\u00e8s diff\u00e9rente des portraits argentiques en noir et blanc de la m\u00eame \u00e9poque<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#6a8ab0\"><\/span>\n <div><div class=\"pal-name\">Bleus du ciel d’une douceur inhabituelle<\/div><div class=\"pal-desc\">Le ciel est rendu avec une teinte bleu-gris douce, jamais agressif \u2014 les photographes de l’\u00e9poque \u00e9taient frapp\u00e9s par cette retenue<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#c0808a\"><\/span>\n <div><div class=\"pal-name\">Rouges et roses l\u00e9g\u00e8rement voil\u00e9s<\/div><div class=\"pal-desc\">Le filtre orang\u00e9 de correction att\u00e9nue les rouges vifs. Les fleurs rouges sont rendu avec une l\u00e9g\u00e8re patine ros\u00e9e, jamais criarde<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#e8d8b0\"><\/span>\n <div><div class=\"pal-name\">Blancs l\u00e9g\u00e8rement cr\u00e9meux<\/div><div class=\"pal-desc\">La diffusion des granules donne aux blancs une l\u00e9g\u00e8re teinte ivoire \u2014 jamais le blanc clinique du papier photographique moderne<\/div><\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">Pourquoi cette palette est-elle si particuli\u00e8re ?<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udca1<\/div>\n <div><div class=\"pkey\">70% de lumi\u00e8re absorb\u00e9e<\/div><div class=\"pval\">Les granules filtrent la majorit\u00e9 de la lumi\u00e8re incidente. Cela renforce la perception de la saturation <em>\u2014 les couleurs semblent plus riches qu’en r\u00e9alit\u00e9<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd2c<\/div>\n <div><div class=\"pkey\">Granules spectralement imparfaits<\/div><div class=\"pval\">Les filtres color\u00e9s des granules ne couvrent pas les zones spectrales th\u00e9oriques id\u00e9ales. Il y a des chevauchements et des lacunes <em>\u2014 source de la douceur caract\u00e9ristique<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udf1f<\/div>\n <div><div class=\"pkey\">Distribution al\u00e9atoire des granules<\/div><div class=\"pval\">Contrairement aux pixels r\u00e9guliers d’un \u00e9cran, les granules sont dispers\u00e9s au hasard. Cela produit un flou chromatique doux aux contours <em>\u2014 l’effet \u00ab\u00a0pointilliste\u00a0\u00bb tant admir\u00e9<\/em><\/div><\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>La comparaison avec les Pointillistes :<\/strong> les contemporains des fr\u00e8res Lumi\u00e8re faisaient syst\u00e9matiquement le rapprochement avec les toiles de Seurat et Signac \u2014 m\u00eame technique de m\u00e9lange optique des couleurs, m\u00eame douceur de rendu. Ce n’est pas un hasard : les deux approches exploitent le m\u00eame ph\u00e9nom\u00e8ne de fusion des couleurs par l’\u0153il.<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s4\">\n <button class=\"sec-trigger\" onclick=\"toggle('s4')\">\n <div class=\"sec-icon\">\ud83d\udcdc<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Limites, h\u00e9ritage & collections<\/span>\n <span class=\"sec-sub\">Ce qu’il reste \u2014 et ce que l’autochrome a chang\u00e9<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’autochrome a domin\u00e9 la photographie couleur pendant pr\u00e8s de trente ans. Son abandon au profit du Kodachrome (1935) ne tient pas \u00e0 un d\u00e9faut de qualit\u00e9, mais \u00e0 l’impraticabilit\u00e9 croissante d’un support en verre lourd et fragile face aux films souples et l\u00e9gers. Ce qu’il a laiss\u00e9 est consid\u00e9rable.<\/p>\n\n <div class=\"slabel\">Les limites techniques<\/div>\n <div class=\"checks\">\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Pose longue :<\/strong> 1 \u00e0 4 secondes en plein soleil. Tout sujet en mouvement \u2014 enfants, animaux, eau, v\u00e9g\u00e9taux par vent \u2014 est flou ou impossible. La photo de rue spontan\u00e9e est quasi inexistante.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Plaque unique et fragile :<\/strong> le verre se brise, et l’image ne peut pas \u00eatre reproduite fid\u00e8lement. Chaque autochrome est une pi\u00e8ce originale non duplicable.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Co\u00fbt \u00e9lev\u00e9 :<\/strong> ~5 francs l’unit\u00e9 en 1907 \u2014 l’\u00e9quivalent de plusieurs heures de salaire ouvrier. Accessible aux amateurs ais\u00e9s mais hors de port\u00e9e du grand public populaire.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Observation en transparence uniquement :<\/strong> la plaque doit \u00eatre tenue devant une source lumineuse ou projet\u00e9e. Elle ne peut pas \u00eatre imprim\u00e9e sur papier sans perdre ses qualit\u00e9s chromatiques.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Rendu chromatique fid\u00e8le :<\/strong> malgr\u00e9 ses imperfections, l’autochrome rend des couleurs bien plus proches de la r\u00e9alit\u00e9 que tout ce qui existait avant. Pour la premi\u00e8re fois, une photographie de famille en couleurs fid\u00e8les est possible.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Durabilit\u00e9 remarquable :<\/strong> les plaques conserv\u00e9es en conditions correctes traversent le temps avec une stabilit\u00e9 exceptionnelle. Des autochromes de 1907 sont encore parfaitement lisibles aujourd’hui.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"sep\"><\/div>\n\n <div class=\"slabel\">Les grandes collections mondiales<\/div>\n <div class=\"collections\">\n <div class=\"coll-head\">Fonds patrimoniaux majeurs<\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">72 000<\/div>\n <div>\n <div class=\"coll-place\">Mus\u00e9e Albert Kahn \u2014 Boulogne-Billancourt<\/div>\n <div class=\"coll-detail\">Les <em>Archives de la Plan\u00e8te<\/em> (1909\u20131931) \u2014 mission mondiale de documentation en autochrome financ\u00e9e par le banquier Albert Kahn dans 50 pays. Le plus grand fonds autochrome du monde.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">~7 000<\/div>\n <div>\n <div class=\"coll-place\">Biblioth\u00e8que du Congr\u00e8s \u2014 Washington D.C.<\/div>\n <div class=\"coll-detail\">Fonds comprenant les autochromes de la National Geographic Society (1914\u20131938) et de photographes am\u00e9ricains de l’\u00e9poque.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">~4 000<\/div>\n <div>\n <div class=\"coll-place\">Institut Lumi\u00e8re \u2014 Lyon<\/div>\n <div class=\"coll-detail\">Fonds familial Lumi\u00e8re et archives de production. Site historique des usines o\u00f9 furent fabriqu\u00e9es les plaques.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">Var.<\/div>\n <div>\n <div class=\"coll-place\">Collections dispers\u00e9es (mus\u00e9es, particuliers)<\/div>\n <div class=\"coll-detail\">Des millions de plaques restent dans des collections priv\u00e9es ou des fonds mus\u00e9aux du monde entier \u2014 on estime qu’une grande partie n’est pas encore catalogu\u00e9e.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Albert Kahn et les Archives de la Plan\u00e8te :<\/strong> ce banquier philanthrope avait une vision : documenter le monde en couleurs avant que la modernit\u00e9 ne le transforme irr\u00e9m\u00e9diablement. Il envoya des op\u00e9rateurs sur tous les continents avec des autochromes et un cin\u00e9matographe. Son fonds est aujourd’hui class\u00e9 au registre M\u00e9moire du Monde de l’UNESCO.<\/div>\n\n <div class=\"sep\"><\/div>\n\n <div class=\"slabel\">L’h\u00e9ritage technique<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udcf1<\/div>\n <div><div class=\"pkey\">Le pixel moderne<\/div><div class=\"pval\">La mosa\u00efque de Bayer des capteurs num\u00e9riques (1976) \u2014 qui organise les photosites en rouge, vert, bleu sur le capteur \u2014 est le descendant direct du principe autochrome <em>\u2014 m\u00eame logique de filtres color\u00e9s par pixel<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udfac<\/div>\n <div><div class=\"pkey\">Influence sur le cin\u00e9ma couleur<\/div><div class=\"pval\">Les recherches sur les granules color\u00e9s ont directement influenc\u00e9 le d\u00e9veloppement des films couleur des ann\u00e9es 1930\u20131950, notamment le proc\u00e9d\u00e9 Agfacolor<\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\uddbc<\/div>\n <div><div class=\"pkey\">Document historique unique<\/div><div class=\"pval\">Les autochromes des ann\u00e9es 1907\u20131935 constituent le seul t\u00e9moignage en couleurs de cette p\u00e9riode. Aucune autre source ne montre la couleur des v\u00eatements, des int\u00e9rieurs, des paysages d’avant-guerre avec cette fid\u00e9lit\u00e9<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"https:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/autochrome-Taj_Mahal_1921.webp\"\n alt=\"The Taj Mahal at Agra, India in the early morning light. Autochrome photo dated 1914 by Helen Messinger Murdoch.\n <\/div>, Autochrome photo dated 1914 by Helen Messinger Murdoch\u00a0\u00bb\n style=\u00a0\u00bbwidth: 100%; height: auto; display: block;\u00a0\u00bb\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n The Taj Mahal at Agra, India in the early morning light. Autochrome photo dated 1914 by Helen Messinger Murdoch.\n <\/div>\n <\/div>\n\n \n <div class=\"ac-footer\">\n <span class=\"fbadge sepia\">Invent\u00e9 en 1907<\/span>\n <span class=\"fbadge sepia\">Lyon, France<\/span>\n <span class=\"fbadge\">Synth\u00e8se additive<\/span>\n <span class=\"fbadge\">F\u00e9cule de pomme de terre<\/span>\n <span class=\"fbadge\">Anc\u00eatre du pixel<\/span>\n <\/div>\n\n<\/div>\n\n<script>\nfunction toggle(id) {\n document.getElementById(id).classList.toggle('open');\n}\n<\/script>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>L’Autochrome Lumi\u00e8re \u2014 Premier proc\u00e9d\u00e9 photographique couleur Histoire de la photographie L’Autochrome Lumi\u00e8re Le premier proc\u00e9d\u00e9 photographique couleur accessible au grand public \u2014 invent\u00e9 \u00e0 Lyon \u00e0 partir de f\u00e9cule de pomme de terre 1907 Lyon, France Couleur additive Plaque de verre Auguste & Louis Lumi\u00e8re Une id\u00e9e improbable : recouvrir une plaque de verre…<\/p>\n","protected":false},"author":1,"featured_media":4888,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"normal","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[150],"tags":[151],"class_list":["post-4885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-procedes-photographiques-anciens","tag-autochrome"],"yoast_head":"\n<title>L'Autochrome Lumi\u00e8re - Premier proc\u00e9d\u00e9 photographique couleur - NICOLAS LOUIS<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez l'Autochrome Lumi\u00e8re, le premier proc\u00e9d\u00e9 photo couleur invent\u00e9 \u00e0 Lyon par les fr\u00e8res Lumi\u00e8re. 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z-index: 1;\n}\n.tl-dot.gold {\n background: var(--c-amber);\n box-shadow: 0 0 0 2px var(--c-amber);\n}\n.tl-content { flex: 1; padding-left: 6px; }\n.tl-year {\n font-size: 11px; font-weight: 600;\n color: var(--c-accent);\n letter-spacing: .03em; margin-bottom: 2px;\n}\n.tl-year.gold { color: var(--c-amber); }\n.tl-text { font-size: 13.5px; color: var(--c-text); line-height: 1.55; }\n.tl-text em { color: var(--c-muted); font-style: italic; font-size: 12.5px; }\n\n\/* \u2500\u2500 Encart mise en valeur \u2500\u2500 *\/\n.highlight {\n background: var(--c-sepia-lt);\n border: 1px solid #d4b896;\n border-left: 4px solid var(--c-sepia);\n border-radius: 0 8px 8px 0;\n padding: 14px 16px;\n margin-bottom: 20px;\n font-size: 13.5px;\n color: var(--c-text);\n line-height: 1.7;\n}\n.highlight strong { color: var(--c-sepia); font-weight: 600; }\n.highlight em { font-style: italic; color: var(--c-muted); }\n\n.tip {\n background: var(--c-warm);\n border-left: 3px solid var(--c-accent);\n border-radius: 0 6px 6px 0;\n padding: 11px 13px;\n font-size: 13px; color: var(--c-muted);\n line-height: 1.65; margin-bottom: 14px;\n}\n.tip strong { color: var(--c-accent); font-weight: 600; }\n.tip em { font-style: italic; }\n\n.warn {\n background: var(--c-amber-lt);\n border-left: 3px solid var(--c-amber);\n border-radius: 0 6px 6px 0;\n padding: 11px 13px;\n font-size: 13px; color: var(--c-amber);\n line-height: 1.65; margin-bottom: 14px;\n}\n.warn strong { font-weight: 600; }\n\n\/* \u2500\u2500 Accord\u00e9ons \u2500\u2500 *\/\n.sections { display: flex; flex-direction: column; gap: 8px; }\n.sec {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 9px; overflow: hidden;\n transition: border-color .15s;\n}\n.sec.open { border-color: var(--c-border-md); }\n.sec-trigger {\n display: flex; align-items: center; gap: 12px;\n padding: 14px 16px;\n cursor: pointer; width: 100%;\n background: none; border: none;\n text-align: left; font-family: var(--font-ui);\n -webkit-tap-highlight-color: transparent;\n min-height: 56px;\n}\n.sec-trigger:active { background: var(--c-warm); }\n.sec-icon {\n width: 32px; height: 32px; border-radius: 8px;\n background: var(--c-sepia-lt);\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0; font-size: 16px;\n}\n.sec-title-wrap { flex: 1; min-width: 0; }\n.sec-title {\n font-family: var(--font-body);\n font-size: 16px; font-weight: 600;\n color: var(--c-sepia); line-height: 1.2;\n}\n.sec-sub {\n font-size: 12px; color: var(--c-faint);\n font-style: italic; margin-top: 2px;\n}\n.chevron {\n width: 18px; height: 18px; flex-shrink: 0;\n color: var(--c-faint);\n transition: transform .22s ease;\n}\n.sec.open .chevron { transform: rotate(180deg); }\n.sec-body {\n display: none;\n padding: 0 16px 18px;\n border-top: 1px solid var(--c-border);\n}\n.sec.open .sec-body { display: block; }\n.sec-intro {\n font-size: 14px; color: var(--c-text);\n line-height: 1.7; padding-top: 16px;\n margin-bottom: 16px;\n font-family: var(--font-body);\n}\n\n\/* \u2500\u2500 Labels \u2500\u2500 *\/\n.slabel {\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted); margin-bottom: 8px; margin-top: 14px;\n}\n.slabel:first-of-type { margin-top: 0; }\n\n\/* \u2500\u2500 Steps \u2500\u2500 *\/\n.steps { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }\n.step {\n display: flex; align-items: flex-start; gap: 10px;\n padding: 11px 12px;\n border: 1px solid var(--c-border);\n border-radius: 8px; background: var(--c-bg);\n}\n.snum {\n width: 24px; height: 24px; border-radius: 50%;\n background: var(--c-sepia); color: #fff;\n font-size: 12px; font-weight: 600;\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0; margin-top: 2px;\n}\n.stxt { font-size: 13.5px; color: var(--c-text); line-height: 1.6; }\n.stxt strong { color: var(--c-sepia); font-weight: 600; }\n.stxt em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Param rows \u2500\u2500 *\/\n.params { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }\n.prow {\n display: flex; align-items: flex-start; gap: 10px;\n background: var(--c-bg);\n border: 1px solid var(--c-border);\n border-radius: 8px; padding: 11px 12px;\n}\n.picon {\n width: 30px; height: 30px; border-radius: 7px;\n background: var(--c-sepia-lt);\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0; font-size: 15px;\n}\n.pkey { font-size: 11px; font-weight: 600; color: var(--c-muted); margin-bottom: 3px; }\n.pval { font-size: 13.5px; color: var(--c-text); line-height: 1.5; }\n.pval em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Couches sch\u00e9ma \u2500\u2500 *\/\n.layers {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.layers-head {\n background: #f2ede6;\n padding: 8px 14px;\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted);\n border-bottom: 1px solid var(--c-border-md);\n}\n.layer-row {\n display: flex; align-items: center; gap: 12px;\n padding: 10px 14px;\n border-bottom: 1px solid var(--c-border);\n}\n.layer-row:last-child { border-bottom: none; }\n.layer-bar {\n width: 38px; height: 16px; border-radius: 3px;\n flex-shrink: 0; border: 1px solid rgba(0,0,0,.08);\n}\n.layer-num {\n width: 22px; height: 22px; border-radius: 50%;\n font-size: 11px; font-weight: 600; color: #fff;\n display: flex; align-items: center; justify-content: center;\n flex-shrink: 0; background: var(--c-sepia);\n}\n.layer-title { font-size: 13px; font-weight: 600; color: var(--c-sepia); }\n.layer-detail { font-size: 12px; color: var(--c-muted); margin-top: 2px; line-height: 1.4; }\n\n\/* \u2500\u2500 Grains mosa\u00efque SVG \u2500\u2500 *\/\n.mosaic-wrap {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.mosaic-wrap svg { width: 100%; height: auto; display: block; }\n\n\/* \u2500\u2500 Checklist \u2500\u2500 *\/\n.checks { display: flex; flex-direction: column; gap: 7px; margin-bottom: 14px; }\n.chk {\n display: flex; align-items: flex-start; gap: 9px;\n padding: 10px 12px;\n border: 1px solid var(--c-border);\n border-radius: 7px; background: var(--c-bg);\n}\n.cico {\n width: 20px; height: 20px; border-radius: 50%;\n flex-shrink: 0; margin-top: 2px;\n display: flex; align-items: center; justify-content: center;\n}\n.cico.ok { background: #d4e8d8; }\n.cico.lim { background: #f0ddd0; }\n.cico svg { width: 10px; height: 10px; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; fill: none; }\n.cico.ok svg { stroke: #2a6a3a; }\n.cico.lim svg { stroke: #8a4a1a; }\n.chk-txt { font-size: 13.5px; color: var(--c-text); line-height: 1.55; }\n.chk-txt em { color: var(--c-muted); font-style: italic; font-size: 12px; }\n\n\/* \u2500\u2500 Palette couleurs \u2500\u2500 *\/\n.palette { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }\n.pal-row {\n display: flex; align-items: center; gap: 12px;\n padding: 10px 12px;\n border: 1px solid var(--c-border);\n border-radius: 8px; background: var(--c-bg);\n}\n.pal-dot {\n width: 32px; height: 32px; border-radius: 50%;\n flex-shrink: 0; border: 1px solid rgba(0,0,0,.10);\n}\n.pal-name { font-size: 13.5px; font-weight: 600; color: var(--c-sepia); }\n.pal-desc { font-size: 12px; color: var(--c-muted); margin-top: 2px; }\n\n\/* \u2500\u2500 Collections card \u2500\u2500 *\/\n.collections {\n background: var(--c-surface);\n border: 1px solid var(--c-border);\n border-radius: 8px; overflow: hidden;\n margin-bottom: 14px;\n}\n.coll-head {\n background: #f2ede6;\n padding: 8px 14px;\n font-size: 10px; font-weight: 600;\n letter-spacing: .07em; text-transform: uppercase;\n color: var(--c-muted);\n border-bottom: 1px solid var(--c-border-md);\n}\n.coll-row {\n display: flex; align-items: flex-start; gap: 12px;\n padding: 11px 14px;\n border-bottom: 1px solid var(--c-border);\n}\n.coll-row:last-child { border-bottom: none; }\n.coll-num {\n font-family: var(--font-body);\n font-size: 18px; font-weight: 600;\n color: var(--c-sepia); flex-shrink: 0;\n min-width: 72px;\n}\n.coll-place { font-size: 13px; font-weight: 600; color: var(--c-text); }\n.coll-detail { font-size: 12px; color: var(--c-muted); margin-top: 2px; line-height: 1.4; }\n\n\/* \u2500\u2500 Sep \u2500\u2500 *\/\n.sep { border-top: 1px solid var(--c-border); margin: 14px 0; }\n\n\/* \u2500\u2500 Footer \u2500\u2500 *\/\n.ac-footer {\n margin-top: 20px; padding-top: 16px;\n border-top: 1px solid var(--c-border);\n display: flex; flex-wrap: wrap; gap: 8px;\n}\n.fbadge {\n font-size: 11px; font-weight: 500;\n padding: 4px 12px; border-radius: 20px;\n border: 1px solid var(--c-border-md);\n color: var(--c-muted);\n}\n.fbadge.sepia {\n background: var(--c-sepia-lt);\n color: var(--c-sepia);\n border-color: #d4b896;\n}\n<\/style>\n<\/head>\n<body>\n\n<div class=\"ac\">\n\n \n <div class=\"ac-hero\">\n <div class=\"ac-kicker\">Histoire de la photographie<\/div>\n <h1>L’Autochrome Lumi\u00e8re<\/h1>\n <div class=\"ac-hero-sub\">Le premier proc\u00e9d\u00e9 photographique couleur accessible au grand public \u2014 invent\u00e9 \u00e0 Lyon \u00e0 partir de f\u00e9cule de pomme de terre<\/div>\n <div class=\"hero-tags\">\n <span class=\"htag\">1907<\/span>\n <span class=\"htag\">Lyon, France<\/span>\n <span class=\"htag\">Couleur additive<\/span>\n <span class=\"htag\">Plaque de verre<\/span>\n <span class=\"htag\">Auguste & Louis Lumi\u00e8re<\/span>\n <\/div>\n <\/div>\n\n \n <div class=\"highlight\">\n <strong>Une id\u00e9e improbable :<\/strong> recouvrir une plaque de verre de millions de grains de f\u00e9cule de pomme de terre color\u00e9s en rouge, vert et bleu \u2014 chaque grain mesurant 10 \u00e0 15 microns, invisibles \u00e0 l’\u0153il nu. Derri\u00e8re cette couche de f\u00e9cule, une \u00e9mulsion argentique classique. La lumi\u00e8re traverse les grains color\u00e9s, impressionne la g\u00e9latine, et l’image qui en r\u00e9sulte est en couleurs. C’est le principe de la <strong>synth\u00e8se additive<\/strong>, le m\u00eame fondement que nos \u00e9crans num\u00e9riques aujourd’hui.\n <\/div>\n\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"https:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/autochrome-lyon-pont_du_change-quai_de_Saone.webp\"\n alt=\"Pont du Change, quai de Sa\u00f4ne. Plaque autochrome Lumi\u00e8re, 1935\"\n style=\"width: 100%; height: auto; display: block;\"\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n Pont du Change, quai de Sa\u00f4ne. Plaque autochrome Lumi\u00e8re, 1935. Collection Institut Lumi\u00e8re\n <\/div>\n\n<\/div>\n\n \n <div class=\"sections\">\n\n \n <div class=\"sec open\" id=\"s0\">\n <button class=\"sec-trigger\" onclick=\"toggle('s0')\">\n <div class=\"sec-icon\">\ud83c\udfdb<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Histoire & contexte<\/span>\n <span class=\"sec-sub\">Des fr\u00e8res Lumi\u00e8re \u00e0 la conqu\u00eate mondiale de la couleur<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">Auguste et Louis Lumi\u00e8re sont connus dans le monde entier pour avoir invent\u00e9 le cin\u00e9matographe en 1895. Mais leur \u0153uvre scientifique est bien plus vaste. C’est dans leurs usines lyonnaises, \u00e0 partir de 1891, qu’ils d\u00e9veloppent en parall\u00e8le ce qui deviendra le premier proc\u00e9d\u00e9 couleur industriellement viable de l’histoire.<\/p>\n\n <div class=\"slabel\">Chronologie<\/div>\n <div class=\"timeline\">\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1891\u20131903<\/div>\n <div class=\"tl-text\">Les fr\u00e8res Lumi\u00e8re commencent leurs recherches sur la photographie en couleurs. Ils explorent plusieurs voies avant de s’orienter vers le principe de la mosa\u00efque de filtres color\u00e9s.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1904<\/div>\n <div class=\"tl-text\">D\u00e9p\u00f4t du brevet de l’autochrome. La technique est au point : granules de f\u00e9cule teint\u00e9s, poudre de charbon pour combler les interstices, vernis de protection, \u00e9mulsion panchromatique.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot gold\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year gold\">10 juin 1907<\/div>\n <div class=\"tl-text\"><strong>Pr\u00e9sentation officielle \u00e0 Paris<\/strong> dans les salons de L’Illustration. En quelques semaines, les commandes affluent du monde entier. C’est une r\u00e9volution.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot gold\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year gold\">1910\u20131925<\/div>\n <div class=\"tl-text\">Apog\u00e9e de l’autochrome. Les usines Lumi\u00e8re \u00e0 Lyon produisent <strong>jusqu’\u00e0 6 000 plaques par jour<\/strong>. L\u00e9on Gimpel, Heinrich K\u00fchn, Alfred Stieglitz et les Pictorialistes du monde entier l’adoptent.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1909\u20131913<\/div>\n <div class=\"tl-text\">Albert Kahn, banquier philanthrope, finance les <em>Archives de la Plan\u00e8te<\/em> : une mission mondiale de documentation en autochrome. R\u00e9sultat : 72 000 plaques repr\u00e9sentant 50 pays.<\/div>\n <\/div>\n <\/div>\n <div class=\"tl-item\">\n <div class=\"tl-dot\"><\/div>\n <div class=\"tl-content\">\n <div class=\"tl-year\">1935<\/div>\n <div class=\"tl-text\">Lancement du <strong>Kodachrome<\/strong> par Kodak \u2014 film couleur moderne sur support souple. L’autochrome est progressivement abandonn\u00e9. Il aura domin\u00e9 la couleur photographique pendant pr\u00e8s de 30 ans.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Les fr\u00e8res Lumi\u00e8re :<\/strong> Auguste (1862\u20131954) \u00e9tait davantage le chimiste, Louis (1864\u20131948) l’ing\u00e9nieur et l’inventeur. L’autochrome est souvent attribu\u00e9 \u00e0 Louis, mais les deux fr\u00e8res ont travaill\u00e9 conjointement sur l’ensemble du proc\u00e9d\u00e9. Leur usine \u00e0 Lyon-Monplaisir employait plusieurs milliers d’ouvriers au d\u00e9but du XXe si\u00e8cle.<\/div>\n\n <div class=\"slabel\">Le contexte scientifique<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd2c<\/div>\n <div><div class=\"pkey\">James Clerk Maxwell, 1861<\/div><div class=\"pval\">Premi\u00e8re photographie couleur par synth\u00e8se additive <em>\u2014 trois n\u00e9gatifs noir et blanc pris \u00e0 travers des filtres rouge, vert, bleu, projet\u00e9s superpos\u00e9s<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udfa8<\/div>\n <div><div class=\"pkey\">Charles Cros & Louis Ducos du Hauron, 1869<\/div><div class=\"pval\">Premiers brevets fran\u00e7ais sur la photographie couleur <em>\u2014 principes th\u00e9oriques de la trichromie soustractive et additive<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udca1<\/div>\n <div><div class=\"pkey\">L’apport des Lumi\u00e8re<\/div><div class=\"pval\">Industrialiser le proc\u00e9d\u00e9 : passer d’une technique de laboratoire \u00e0 une plaque vendue en bo\u00eete, utilisable par n’importe quel photographe amateur avec un appareil ordinaire<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"\nhttps:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/Two_women_holding_a_sign_that_readsEaster.webp\"\n alt=\"Autochrome - Two women holding a sign that readsEaster Holidays!\"\n style=\"width: 100%; height: auto; display: block;\"\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n Autochrome – Two women holding a sign that readsEaster Holidays! Take a Kodak with you Prices from 5\n <\/div>\n<\/div>\n\n \n <div class=\"sec\" id=\"s1\">\n <button class=\"sec-trigger\" onclick=\"toggle('s1')\">\n <div class=\"sec-icon\">\ud83d\udd34<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Le principe optique<\/span>\n <span class=\"sec-sub\">La mosa\u00efque additive \u2014 anc\u00eatre du pixel<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’autochrome fonctionne sur le principe de la <strong>synth\u00e8se additive des couleurs<\/strong> \u2014 le m\u00eame principe que les \u00e9crans LCD ou OLED que vous utilisez aujourd’hui. Chaque granule de f\u00e9cule est un minuscule filtre color\u00e9. L’\u0153il humain, incapable de distinguer des points s\u00e9par\u00e9s de moins de 0,1 mm \u00e0 distance normale, fusionne ces millions de petites taches color\u00e9es en une image continue.<\/p>\n\n <div class=\"slabel\">La mosa\u00efque de granules \u2014 sch\u00e9ma<\/div>\n <div class=\"mosaic-wrap\">\n <svg viewBox=\"0 0 340 220\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"font-family:var(--font-ui)\">\n \n <rect width=\"340\" height=\"220\" fill=\"#f5f0e8\"\/>\n\n \n <text x=\"170\" y=\"18\" text-anchor=\"middle\" font-size=\"10\" fill=\"#6b6560\" font-weight=\"600\" letter-spacing=\".05em\" text-decoration=\"none\">COUPE TRANSVERSALE D’UNE PLAQUE AUTOCHROME<\/text>\n\n \n <rect x=\"20\" y=\"28\" width=\"300\" height=\"24\" fill=\"#b0c8d8\" opacity=\".5\" rx=\"2\"\/>\n <text x=\"326\" y=\"44\" font-size=\"9\" fill=\"#6b6560\">Verre<\/text>\n\n \n <rect x=\"20\" y=\"52\" width=\"300\" height=\"8\" fill=\"#e8d8a0\" opacity=\".7\" rx=\"1\"\/>\n <text x=\"326\" y=\"59\" font-size=\"9\" fill=\"#6b6560\">Vernis<\/text>\n\n \n <rect x=\"20\" y=\"60\" width=\"300\" height=\"20\" fill=\"#c8c0a8\" opacity=\".6\" rx=\"1\"\/>\n <text x=\"326\" y=\"73\" font-size=\"9\" fill=\"#6b6560\">\u00c9mulsion<\/text>\n\n \n \n <ellipse cx=\"30\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"44\" cy=\"91\" rx=\"6\" ry=\"6\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"57\" cy=\"94\" rx=\"8\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"70\" cy=\"92\" rx=\"6\" ry=\"6\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"83\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"96\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"108\" cy=\"94\" rx=\"7\" ry=\"6\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"121\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"133\" cy=\"93\" rx=\"7\" ry=\"6\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"146\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"159\" cy=\"94\" rx=\"8\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"172\" cy=\"92\" rx=\"6\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"184\" cy=\"93\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"197\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"210\" cy=\"94\" rx=\"7\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"222\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"235\" cy=\"93\" rx=\"8\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"248\" cy=\"91\" rx=\"6\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"260\" cy=\"94\" rx=\"7\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"273\" cy=\"92\" rx=\"6\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n <ellipse cx=\"286\" cy=\"93\" rx=\"7\" ry=\"6\" fill=\"#2a3a9a\" opacity=\".85\"\/>\n <ellipse cx=\"299\" cy=\"91\" rx=\"6\" ry=\"5\" fill=\"#c83030\" opacity=\".85\"\/>\n <ellipse cx=\"311\" cy=\"94\" rx=\"7\" ry=\"5\" fill=\"#2a7a2a\" opacity=\".85\"\/>\n\n \n <ellipse cx=\"37\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"51\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"64\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"78\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"91\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"115\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"127\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"152\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"167\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"190\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"204\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"228\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"243\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"267\" cy=\"96\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"280\" cy=\"97\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n <ellipse cx=\"305\" cy=\"95\" rx=\"2\" ry=\"2\" fill=\"#1a1a1a\" opacity=\".6\"\/>\n\n \n <text x=\"170\" y=\"112\" text-anchor=\"middle\" font-size=\"9\" fill=\"#6b6560\" font-style=\"italic\">\u2248 4 millions de granules par cm\u00b2 \u2014 diam\u00e8tre moyen 10\u201315 \u00b5m<\/text>\n\n \n <rect x=\"20\" y=\"116\" width=\"300\" height=\"7\" fill=\"#e8d8a0\" opacity=\".5\" rx=\"1\"\/>\n <text x=\"326\" y=\"122\" font-size=\"9\" fill=\"#6b6560\">Vernis<\/text>\n\n \n <line x1=\"20\" y1=\"136\" x2=\"320\" y2=\"136\" stroke=\"#cec8be\" stroke-width=\"0.5\" stroke-dasharray=\"4,3\"\/>\n\n \n <text x=\"170\" y=\"152\" text-anchor=\"middle\" font-size=\"10\" fill=\"#6b6560\" font-weight=\"600\" letter-spacing=\".04em\">SYNTH\u00c8SE ADDITIVE \u2014 FUSION DES COULEURS<\/text>\n\n \n <circle cx=\"130\" cy=\"185\" r=\"22\" fill=\"#c83030\" opacity=\".55\"\/>\n <circle cx=\"150\" cy=\"185\" r=\"22\" fill=\"#2a7a2a\" opacity=\".55\"\/>\n <circle cx=\"140\" cy=\"169\" r=\"22\" fill=\"#2a3a9a\" opacity=\".55\"\/>\n \n <circle cx=\"140\" cy=\"180\" r=\"9\" fill=\"#f5f0e8\" opacity=\".9\"\/>\n <text x=\"140\" y=\"183\" text-anchor=\"middle\" font-size=\"8\" fill=\"#5a3a1a\" font-weight=\"600\">blanc<\/text>\n\n \n <line x1=\"176\" y1=\"180\" x2=\"200\" y2=\"180\" stroke=\"#9c958d\" stroke-width=\"1.2\" marker-end=\"url(#arr)\"\/>\n <defs>\n <marker id=\"arr\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"3\" orient=\"auto\">\n <path d=\"M0,0 L6,3 L0,6 Z\" fill=\"#9c958d\"\/>\n <\/marker>\n <\/defs>\n\n \n <rect x=\"204\" y=\"162\" width=\"100\" height=\"36\" rx=\"3\" fill=\"#8a9a7a\" opacity=\".7\"\/>\n <rect x=\"204\" y=\"162\" width=\"30\" height=\"36\" rx=\"0\" fill=\"#5a7a4a\" opacity=\".8\"\/>\n <rect x=\"264\" y=\"162\" width=\"40\" height=\"36\" rx=\"0\" fill=\"#6a8a8a\" opacity=\".6\"\/>\n <ellipse cx=\"235\" cy=\"180\" rx=\"12\" ry=\"10\" fill=\"#c8a060\" opacity=\".7\"\/>\n <text x=\"254\" y=\"208\" text-anchor=\"middle\" font-size=\"9\" fill=\"#6b6560\" font-style=\"italic\">Image per\u00e7ue \u00e0 distance<\/text>\n\n \n <text x=\"117\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#c83030\" font-weight=\"600\">Rouge<\/text>\n <text x=\"140\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#2a3a9a\" font-weight=\"600\">Bleu<\/text>\n <text x=\"163\" y=\"213\" text-anchor=\"middle\" font-size=\"8.5\" fill=\"#2a7a2a\" font-weight=\"600\">Vert<\/text>\n <\/svg>\n <\/div>\n\n <div class=\"slabel\">Comment l’\u0153il reconstitue les couleurs<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">La lumi\u00e8re blanche du sujet photographi\u00e9 traverse d’abord la vitre de verre, puis la couche de granules de f\u00e9cule color\u00e9s.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Chaque granule rouge ne laisse passer que le rouge, chaque granule vert que le vert, chaque granule bleu que le bleu. <strong>Environ 70% de la lumi\u00e8re est absorb\u00e9e<\/strong> par les filtres.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\">La lumi\u00e8re filtr\u00e9e impressionne l’<strong>\u00e9mulsion argentique panchromatique<\/strong> selon son intensit\u00e9. Apr\u00e8s d\u00e9veloppement invers\u00e9 (proc\u00e9d\u00e9 positif direct), les zones bien expos\u00e9es deviennent transparentes.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">\u00c0 la visualisation, la lumi\u00e8re traverse \u00e0 nouveau les granules. L’\u0153il, situ\u00e9 \u00e0 distance normale, est <strong>incapable de distinguer les points individuels<\/strong> (r\u00e9solution de l’\u0153il ~0,1 mm \u00e0 25 cm). Il fusionne les couleurs en teinte continue.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Exactement comme un \u00e9cran LCD :<\/strong> un pixel d’\u00e9cran est compos\u00e9 de trois sous-pixels rouge, vert, bleu juxtapos\u00e9s. L’\u0153il les fusionne en une couleur unique. Les granules d’autochrome fonctionnent sur le m\u00eame principe, avec 120 ans d’avance \u2014 sauf que les filtres sont al\u00e9atoirement distribu\u00e9s plut\u00f4t qu’en grille r\u00e9guli\u00e8re.<\/div>\n\n <div class=\"slabel\">R\u00e9partition des granules<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd34<\/div>\n <div><div class=\"pkey\">Rouge-orange<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule de pomme de terre teint\u00e9e \u00e0 l’alizarine ou \u00e0 l’\u00e9rythrosine<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udfe2<\/div>\n <div><div class=\"pkey\">Vert<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule teint\u00e9e au vert malachite ou \u00e0 la tartrazine<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd35<\/div>\n <div><div class=\"pkey\">Bleu-violet<\/div><div class=\"pval\">~33% des granules <em>\u2014 f\u00e9cule teint\u00e9e \u00e0 l’indigo ou au bleu d’aniline<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\u26ab<\/div>\n <div><div class=\"pkey\">Charbon de bois fin<\/div><div class=\"pval\">Comble les interstices entre les granules pour \u00e9viter les fuites de lumi\u00e8re blanche <em>\u2014 sans lui, les blancs seraient parasit\u00e9s<\/em><\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s2\">\n <button class=\"sec-trigger\" onclick=\"toggle('s2')\">\n <div class=\"sec-icon\">\ud83c\udfed<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Fabrication & prise de vue<\/span>\n <span class=\"sec-sub\">De la plaque vierge \u00e0 l’image couleur<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">La fabrication d’une plaque autochrome est un processus industriel complexe qui requiert une pr\u00e9cision extr\u00eame. La moindre irr\u00e9gularit\u00e9 dans la distribution des granules ou l’\u00e9paisseur de l’\u00e9mulsion se traduit directement par un d\u00e9faut de rendu chromatique.<\/p>\n\n <div class=\"slabel\">Fabrication en usine \u2014 les couches de la plaque<\/div>\n <div class=\"layers\">\n <div class=\"layers-head\">Structure d’une plaque autochrome (de bas en haut)<\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">1<\/div>\n <div class=\"layer-bar\" style=\"background:#b0c8d8\"><\/div>\n <div>\n <div class=\"layer-title\">Plaque de verre<\/div>\n <div class=\"layer-detail\">Support rigide, 9\u00d712 cm standard. Le verre est nettoy\u00e9 et d\u00e9poli l\u00e9g\u00e8rement pour favoriser l’adh\u00e9rence.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">2<\/div>\n <div class=\"layer-bar\" style=\"background:#e8d0a0\"><\/div>\n <div>\n <div class=\"layer-title\">Vernis adh\u00e9sif<\/div>\n <div class=\"layer-detail\">Fine couche collante qui va retenir les granules de f\u00e9cule lors du saupoudrage.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">3<\/div>\n <div class=\"layer-bar\" style=\"background:linear-gradient(90deg,#c83030 33%,#2a7a2a 66%,#2a3a9a 100%)\"><\/div>\n <div>\n <div class=\"layer-title\">Granules de f\u00e9cule color\u00e9s<\/div>\n <div class=\"layer-detail\">~4 millions\/cm\u00b2 saupoudr\u00e9s al\u00e9atoirement, lamin\u00e9s sous presse, puis rempli des interstices au charbon de bois fin. Vernis de protection appliqu\u00e9 par-dessus.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">4<\/div>\n <div class=\"layer-bar\" style=\"background:#c8c0a8\"><\/div>\n <div>\n <div class=\"layer-title\">\u00c9mulsion panchromatique<\/div>\n <div class=\"layer-detail\">G\u00e9latine-bromure d’argent sensible \u00e0 toutes les longueurs d’onde du visible. Couch\u00e9e sur les granules vernis. C’est l’\u00e2me argentique de la plaque.<\/div>\n <\/div>\n <\/div>\n <div class=\"layer-row\">\n <div class=\"layer-num\">5<\/div>\n <div class=\"layer-bar\" style=\"background:#e8d8a0\"><\/div>\n <div>\n <div class=\"layer-title\">Vernis de protection final<\/div>\n <div class=\"layer-detail\">Prot\u00e8ge l’\u00e9mulsion des chocs et de l’humidit\u00e9. La plaque est vendue en bo\u00eete de 12, pr\u00eate \u00e0 l’emploi.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">La prise de vue<\/div>\n <div class=\"steps\">\n <div class=\"step\">\n <div class=\"snum\">1<\/div>\n <div class=\"stxt\">La plaque est charg\u00e9e dans la chambre photographique <strong>c\u00f4t\u00e9 verre vers l’objectif<\/strong> \u2014 la lumi\u00e8re doit traverser les granules avant d’atteindre l’\u00e9mulsion.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">2<\/div>\n <div class=\"stxt\">Un filtre jaune-orang\u00e9 est plac\u00e9 devant l’objectif pour <strong>corriger la sensibilit\u00e9 excessive du bleu-violet<\/strong> des \u00e9mulsions de l’\u00e9poque \u2014 sans lui, les ciels br\u00fblent et les carnations sont fauss\u00e9es.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">3<\/div>\n <div class=\"stxt\"><strong>Temps de pose longs :<\/strong> 1 \u00e0 4 secondes en pleine lumi\u00e8re d’\u00e9t\u00e9, plusieurs minutes \u00e0 l’ombre ou en int\u00e9rieur. Les 70% de lumi\u00e8re absorb\u00e9s par les granules imposent ces poses longues \u2014 les sujets doivent rester immobiles.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">4<\/div>\n <div class=\"stxt\">Le d\u00e9veloppement suit un <strong>proc\u00e9d\u00e9 invers\u00e9 (r\u00e9version)<\/strong> : l’image latente n\u00e9gative est d’abord d\u00e9velopp\u00e9e, puis blanchie chimiquement, puis re-expos\u00e9e \u00e0 la lumi\u00e8re et re-d\u00e9velopp\u00e9e pour obtenir un positif direct sur la plaque.<\/div>\n <\/div>\n <div class=\"step\">\n <div class=\"snum\">5<\/div>\n <div class=\"stxt\">La plaque termin\u00e9e est <strong>observ\u00e9e en transparence<\/strong> devant une source lumineuse ou projet\u00e9e sur \u00e9cran. Elle ne supporte pas d’\u00eatre dupliqu\u00e9e \u2014 chaque autochrome est unique.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"warn\"><strong>Chaque plaque est une pi\u00e8ce unique et irrempla\u00e7able.<\/strong> Contrairement au n\u00e9gatif argentique qui permet des tirages multiples, l’autochrome ne peut pas \u00eatre copi\u00e9 fid\u00e8lement. C’est \u00e0 la fois sa fragilit\u00e9 et sa valeur artistique.<\/div>\n\n <div class=\"tip\"><strong>Le filtre jaune-orang\u00e9 :<\/strong> appel\u00e9 filtre de correction ortho ou pan, il compensait le d\u00e9ficit de sensibilit\u00e9 au rouge des \u00e9mulsions orthochromatiques de l’\u00e9poque. Sans lui, les roses et les rouges ressortaient trop sombres, les ciels trop clairs. Son usage \u00e9tait syst\u00e9matique chez les photographes autochromes exp\u00e9riment\u00e9s.<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s3\">\n <button class=\"sec-trigger\" onclick=\"toggle('s3')\">\n <div class=\"sec-icon\">\ud83c\udfa8<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">L’esth\u00e9tique autochrome<\/span>\n <span class=\"sec-sub\">Une palette douce, lumineuse, presque pictorialiste<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’esth\u00e9tique autochrome est imm\u00e9diatement reconnaissable. Les couleurs sont douces, l\u00e9g\u00e8rement voil\u00e9es, avec une qualit\u00e9 lumineuse que les photographes de l’\u00e9poque comparaient aux vitraux gothiques ou aux toiles des Impressionnistes et Pointillistes. Cette palette particuli\u00e8re tient \u00e0 la physique m\u00eame du proc\u00e9d\u00e9.<\/p>\n\n <div class=\"slabel\">La palette caract\u00e9ristique<\/div>\n <div class=\"palette\">\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#2a4a30\"><\/span>\n <div><div class=\"pal-name\">Verts profonds et soutenus<\/div><div class=\"pal-desc\">La chlorophylle des feuillages r\u00e9agit particuli\u00e8rement bien aux granules verts \u2014 les jardins et les v\u00e9g\u00e9taux sont souvent les sujets les plus r\u00e9ussis<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#c8a070\"><\/span>\n <div><div class=\"pal-name\">Chairs chaudes et lumineuses<\/div><div class=\"pal-desc\">Les portraits en autochrome ont une qualit\u00e9 de peau dor\u00e9e et douce, tr\u00e8s diff\u00e9rente des portraits argentiques en noir et blanc de la m\u00eame \u00e9poque<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#6a8ab0\"><\/span>\n <div><div class=\"pal-name\">Bleus du ciel d’une douceur inhabituelle<\/div><div class=\"pal-desc\">Le ciel est rendu avec une teinte bleu-gris douce, jamais agressif \u2014 les photographes de l’\u00e9poque \u00e9taient frapp\u00e9s par cette retenue<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#c0808a\"><\/span>\n <div><div class=\"pal-name\">Rouges et roses l\u00e9g\u00e8rement voil\u00e9s<\/div><div class=\"pal-desc\">Le filtre orang\u00e9 de correction att\u00e9nue les rouges vifs. Les fleurs rouges sont rendu avec une l\u00e9g\u00e8re patine ros\u00e9e, jamais criarde<\/div><\/div>\n <\/div>\n <div class=\"pal-row\">\n <span class=\"pal-dot\" style=\"background:#e8d8b0\"><\/span>\n <div><div class=\"pal-name\">Blancs l\u00e9g\u00e8rement cr\u00e9meux<\/div><div class=\"pal-desc\">La diffusion des granules donne aux blancs une l\u00e9g\u00e8re teinte ivoire \u2014 jamais le blanc clinique du papier photographique moderne<\/div><\/div>\n <\/div>\n <\/div>\n\n <div class=\"slabel\">Pourquoi cette palette est-elle si particuli\u00e8re ?<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udca1<\/div>\n <div><div class=\"pkey\">70% de lumi\u00e8re absorb\u00e9e<\/div><div class=\"pval\">Les granules filtrent la majorit\u00e9 de la lumi\u00e8re incidente. Cela renforce la perception de la saturation <em>\u2014 les couleurs semblent plus riches qu’en r\u00e9alit\u00e9<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udd2c<\/div>\n <div><div class=\"pkey\">Granules spectralement imparfaits<\/div><div class=\"pval\">Les filtres color\u00e9s des granules ne couvrent pas les zones spectrales th\u00e9oriques id\u00e9ales. Il y a des chevauchements et des lacunes <em>\u2014 source de la douceur caract\u00e9ristique<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udf1f<\/div>\n <div><div class=\"pkey\">Distribution al\u00e9atoire des granules<\/div><div class=\"pval\">Contrairement aux pixels r\u00e9guliers d’un \u00e9cran, les granules sont dispers\u00e9s au hasard. Cela produit un flou chromatique doux aux contours <em>\u2014 l’effet \u00ab\u00a0pointilliste\u00a0\u00bb tant admir\u00e9<\/em><\/div><\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>La comparaison avec les Pointillistes :<\/strong> les contemporains des fr\u00e8res Lumi\u00e8re faisaient syst\u00e9matiquement le rapprochement avec les toiles de Seurat et Signac \u2014 m\u00eame technique de m\u00e9lange optique des couleurs, m\u00eame douceur de rendu. Ce n’est pas un hasard : les deux approches exploitent le m\u00eame ph\u00e9nom\u00e8ne de fusion des couleurs par l’\u0153il.<\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"sec\" id=\"s4\">\n <button class=\"sec-trigger\" onclick=\"toggle('s4')\">\n <div class=\"sec-icon\">\ud83d\udcdc<\/div>\n <span class=\"sec-title-wrap\">\n <span class=\"sec-title\">Limites, h\u00e9ritage & collections<\/span>\n <span class=\"sec-sub\">Ce qu’il reste \u2014 et ce que l’autochrome a chang\u00e9<\/span>\n <\/span>\n <svg class=\"chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\"><polyline points=\"6 9 12 15 18 9\"\/><\/svg>\n <\/button>\n <div class=\"sec-body\">\n <p class=\"sec-intro\">L’autochrome a domin\u00e9 la photographie couleur pendant pr\u00e8s de trente ans. Son abandon au profit du Kodachrome (1935) ne tient pas \u00e0 un d\u00e9faut de qualit\u00e9, mais \u00e0 l’impraticabilit\u00e9 croissante d’un support en verre lourd et fragile face aux films souples et l\u00e9gers. Ce qu’il a laiss\u00e9 est consid\u00e9rable.<\/p>\n\n <div class=\"slabel\">Les limites techniques<\/div>\n <div class=\"checks\">\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Pose longue :<\/strong> 1 \u00e0 4 secondes en plein soleil. Tout sujet en mouvement \u2014 enfants, animaux, eau, v\u00e9g\u00e9taux par vent \u2014 est flou ou impossible. La photo de rue spontan\u00e9e est quasi inexistante.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Plaque unique et fragile :<\/strong> le verre se brise, et l’image ne peut pas \u00eatre reproduite fid\u00e8lement. Chaque autochrome est une pi\u00e8ce originale non duplicable.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Co\u00fbt \u00e9lev\u00e9 :<\/strong> ~5 francs l’unit\u00e9 en 1907 \u2014 l’\u00e9quivalent de plusieurs heures de salaire ouvrier. Accessible aux amateurs ais\u00e9s mais hors de port\u00e9e du grand public populaire.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico lim\"><svg viewBox=\"0 0 12 12\"><line x1=\"2\" y1=\"6\" x2=\"10\" y2=\"6\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Observation en transparence uniquement :<\/strong> la plaque doit \u00eatre tenue devant une source lumineuse ou projet\u00e9e. Elle ne peut pas \u00eatre imprim\u00e9e sur papier sans perdre ses qualit\u00e9s chromatiques.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Rendu chromatique fid\u00e8le :<\/strong> malgr\u00e9 ses imperfections, l’autochrome rend des couleurs bien plus proches de la r\u00e9alit\u00e9 que tout ce qui existait avant. Pour la premi\u00e8re fois, une photographie de famille en couleurs fid\u00e8les est possible.<\/div>\n <\/div>\n <div class=\"chk\">\n <div class=\"cico ok\"><svg viewBox=\"0 0 12 12\"><polyline points=\"2,6 5,9 10,3\"\/><\/svg><\/div>\n <div class=\"chk-txt\"><strong>Durabilit\u00e9 remarquable :<\/strong> les plaques conserv\u00e9es en conditions correctes traversent le temps avec une stabilit\u00e9 exceptionnelle. Des autochromes de 1907 sont encore parfaitement lisibles aujourd’hui.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"sep\"><\/div>\n\n <div class=\"slabel\">Les grandes collections mondiales<\/div>\n <div class=\"collections\">\n <div class=\"coll-head\">Fonds patrimoniaux majeurs<\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">72 000<\/div>\n <div>\n <div class=\"coll-place\">Mus\u00e9e Albert Kahn \u2014 Boulogne-Billancourt<\/div>\n <div class=\"coll-detail\">Les <em>Archives de la Plan\u00e8te<\/em> (1909\u20131931) \u2014 mission mondiale de documentation en autochrome financ\u00e9e par le banquier Albert Kahn dans 50 pays. Le plus grand fonds autochrome du monde.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">~7 000<\/div>\n <div>\n <div class=\"coll-place\">Biblioth\u00e8que du Congr\u00e8s \u2014 Washington D.C.<\/div>\n <div class=\"coll-detail\">Fonds comprenant les autochromes de la National Geographic Society (1914\u20131938) et de photographes am\u00e9ricains de l’\u00e9poque.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">~4 000<\/div>\n <div>\n <div class=\"coll-place\">Institut Lumi\u00e8re \u2014 Lyon<\/div>\n <div class=\"coll-detail\">Fonds familial Lumi\u00e8re et archives de production. Site historique des usines o\u00f9 furent fabriqu\u00e9es les plaques.<\/div>\n <\/div>\n <\/div>\n <div class=\"coll-row\">\n <div class=\"coll-num\">Var.<\/div>\n <div>\n <div class=\"coll-place\">Collections dispers\u00e9es (mus\u00e9es, particuliers)<\/div>\n <div class=\"coll-detail\">Des millions de plaques restent dans des collections priv\u00e9es ou des fonds mus\u00e9aux du monde entier \u2014 on estime qu’une grande partie n’est pas encore catalogu\u00e9e.<\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <div class=\"tip\"><strong>Albert Kahn et les Archives de la Plan\u00e8te :<\/strong> ce banquier philanthrope avait une vision : documenter le monde en couleurs avant que la modernit\u00e9 ne le transforme irr\u00e9m\u00e9diablement. Il envoya des op\u00e9rateurs sur tous les continents avec des autochromes et un cin\u00e9matographe. Son fonds est aujourd’hui class\u00e9 au registre M\u00e9moire du Monde de l’UNESCO.<\/div>\n\n <div class=\"sep\"><\/div>\n\n <div class=\"slabel\">L’h\u00e9ritage technique<\/div>\n <div class=\"params\">\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\udcf1<\/div>\n <div><div class=\"pkey\">Le pixel moderne<\/div><div class=\"pval\">La mosa\u00efque de Bayer des capteurs num\u00e9riques (1976) \u2014 qui organise les photosites en rouge, vert, bleu sur le capteur \u2014 est le descendant direct du principe autochrome <em>\u2014 m\u00eame logique de filtres color\u00e9s par pixel<\/em><\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83c\udfac<\/div>\n <div><div class=\"pkey\">Influence sur le cin\u00e9ma couleur<\/div><div class=\"pval\">Les recherches sur les granules color\u00e9s ont directement influenc\u00e9 le d\u00e9veloppement des films couleur des ann\u00e9es 1930\u20131950, notamment le proc\u00e9d\u00e9 Agfacolor<\/div><\/div>\n <\/div>\n <div class=\"prow\">\n <div class=\"picon\">\ud83d\uddbc<\/div>\n <div><div class=\"pkey\">Document historique unique<\/div><div class=\"pval\">Les autochromes des ann\u00e9es 1907\u20131935 constituent le seul t\u00e9moignage en couleurs de cette p\u00e9riode. Aucune autre source ne montre la couleur des v\u00eatements, des int\u00e9rieurs, des paysages d’avant-guerre avec cette fid\u00e9lit\u00e9<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<div style=\"margin: 14px 0; border-radius: 8px; overflow: hidden; border: 1px solid #e2ddd6;\">\n <img decoding=\"async\"\n src=\"https:\/\/nicolaslouis.com\/wordpress\/wp-content\/uploads\/2026\/03\/autochrome-Taj_Mahal_1921.webp\"\n alt=\"The Taj Mahal at Agra, India in the early morning light. Autochrome photo dated 1914 by Helen Messinger Murdoch.\n <\/div>, Autochrome photo dated 1914 by Helen Messinger Murdoch\u00a0\u00bb\n style=\u00a0\u00bbwidth: 100%; height: auto; display: block;\u00a0\u00bb\n \/>\n <div style=\"padding: 8px 14px; font-size: 12px; color: #9c958d; font-style: italic; background: #f5f0e8;\">\n The Taj Mahal at Agra, India in the early morning light. Autochrome photo dated 1914 by Helen Messinger Murdoch.\n <\/div>\n <\/div>\n\n \n <div class=\"ac-footer\">\n <span class=\"fbadge sepia\">Invent\u00e9 en 1907<\/span>\n <span class=\"fbadge sepia\">Lyon, France<\/span>\n <span class=\"fbadge\">Synth\u00e8se additive<\/span>\n <span class=\"fbadge\">F\u00e9cule de pomme de terre<\/span>\n <span class=\"fbadge\">Anc\u00eatre du pixel<\/span>\n <\/div>\n\n<\/div>\n\n<script>\nfunction toggle(id) {\n document.getElementById(id).classList.toggle('open');\n}\n<\/script>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>L’Autochrome Lumi\u00e8re \u2014 Premier proc\u00e9d\u00e9 photographique couleur Histoire de la photographie L’Autochrome Lumi\u00e8re Le premier proc\u00e9d\u00e9 photographique couleur accessible au grand public \u2014 invent\u00e9 \u00e0 Lyon \u00e0 partir de f\u00e9cule de pomme de terre 1907 Lyon, France Couleur additive Plaque de verre Auguste & Louis Lumi\u00e8re Une id\u00e9e improbable : recouvrir une plaque de verre…<\/p>\n","protected":false},"author":1,"featured_media":4888,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"normal","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[150],"tags":[151],"class_list":["post-4885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-procedes-photographiques-anciens","tag-autochrome"],"yoast_head":"\n<title>L'Autochrome Lumi\u00e8re - Premier proc\u00e9d\u00e9 photographique couleur - NICOLAS LOUIS<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez l'Autochrome Lumi\u00e8re, le premier proc\u00e9d\u00e9 photo couleur invent\u00e9 \u00e0 Lyon par les fr\u00e8res Lumi\u00e8re. 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