{"id":107,"date":"2012-01-26T01:57:12","date_gmt":"2012-01-26T00:57:12","guid":{"rendered":"http:\/\/www.proof.de\/?p=107"},"modified":"2020-05-08T12:01:56","modified_gmt":"2020-05-08T10:01:56","slug":"normlicht-d50-oder-d50-oder-was","status":"publish","type":"post","link":"https:\/\/proof.proofen.de\/fr\/normlicht-d50-oder-d50-oder-was\/","title":{"rendered":"Lumi\u00e8re normale et effet de m\u00e9tam\u00e9risme"},"content":{"rendered":"<div class=\"kk-star-ratings kksr-auto kksr-align-right kksr-valign-top\" data-payload='{\"align\":\"right\",\"id\":\"107\",\"slug\":\"default\",\"valign\":\"top\",\"ignore\":\"\",\"reference\":\"auto\",\"class\":\"\",\"count\":\"0\",\"legendonly\":\"\",\"readonly\":\"\",\"score\":\"0\",\"starsonly\":\"\",\"best\":\"5\",\"gap\":\"5\",\"greet\":\"Jetzt bewerten\",\"legend\":\"0\\\/5 - (0 votes)\",\"size\":\"24\",\"title\":\"Normlicht und Metamerie-Effekt\",\"width\":\"0\",\"_legend\":\"{score}\\\/{best} - ({count} {votes})\",\"font_factor\":\"1.25\"}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">\u00c9valuer maintenant<\/span>\n    <\/div>\n    <\/div>\n<p>Un <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/proof\/\" target=\"_self\" title=\"Une \u00e9preuve (correctement appel\u00e9e \u00e9preuve contractuelle ou en anglais Contract Proof) est un moyen de contr\u00f4le certifi\u00e9 selon la norme ISO 12647-7 pour l&#039;industrie graphique. Une \u00e9preuve simule la colorim\u00e9trie de l&#039;impression offset ou de l&#039;h\u00e9liogravure en respectant les couleurs et les tol\u00e9rances \u00e9troites de la norme ISO.\" class=\"encyclopedia\">Proof<\/a> n'est jamais aussi bon que l'\u00e9clairage sous lequel il est observ\u00e9. Se contenter d'aller \u00e0 la fen\u00eatre ou d'allumer la lumi\u00e8re au cr\u00e9puscule ne sert \u00e0 rien : \u00e0 la fen\u00eatre, entre d\u00e9cembre et juillet, entre 8 heures du matin et 8 heures du soir, entre un temps nuageux et un temps ensoleill\u00e9, il y a une \u00e9norme diff\u00e9rence d'\u00e9clairage qui rend impossible toute appr\u00e9ciation des couleurs. Et si l'on allume la lumi\u00e8re, on allume en g\u00e9n\u00e9ral une ampoule de 2700 <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/kelvin\/\" target=\"_self\" title=\"Le kelvin est une unit\u00e9 de temp\u00e9rature absolue utilis\u00e9e dans le domaine scientifique. La lumi\u00e8re du jour est d\u00e9finie par 6500 kelvins. Pour l&#039;impression, la temp\u00e9rature de couleur est de 5000 kelvins en Europe avec la lumi\u00e8re standard D50.\" class=\"encyclopedia\">Kelvin<\/a> une - ou pire encore : une ampoule \u00e0 \u00e9conomie d'\u00e9nergie qui brille d'une mani\u00e8re ou d'une autre dans n'importe quel spectre ... une catastrophe !<\/p>\n<p>C'est dans l'impression que se trouvent les raisons de <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/metamerie\/\" target=\"_self\" title=\"Le terme m\u00e9tam\u00e9risme d\u00e9signe l&#039;effet selon lequel deux choses peuvent para\u00eetre identiques sous une lumi\u00e8re, mais totalement diff\u00e9rentes sous une autre lumi\u00e8re.\" class=\"encyclopedia\">Metamerie<\/a>-(en bref, deux couleurs sont identiques sous une lumi\u00e8re mais totalement diff\u00e9rentes sous une autre), notamment en raison des diff\u00e9rentes technologies d'impression. Des couleurs qui paraissent identiques sous une ampoule \u00e0 incandescence peuvent soudain para\u00eetre tr\u00e8s diff\u00e9rentes sous un tube au n\u00e9on.<\/p>\n<p>Au cours des derni\u00e8res ann\u00e9es, les <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/digitalproofs\/\" target=\"_self\" title=\"Les \u00e9preuves num\u00e9riques (correctement appel\u00e9es \u00e9preuves contractuelles ou en anglais Contract Proofs) sont un moyen de contr\u00f4le certifi\u00e9 ISO pour l&#039;industrie graphique. Les \u00e9preuves num\u00e9riques simulent les couleurs de l&#039;impression offset ou de l&#039;h\u00e9liogravure en respectant les tol\u00e9rances strictes de la norme ISO 12647-7. Elles sont aujourd&#039;hui presque exclusivement calcul\u00e9es par un RIP, puis produites par des imprimantes \u00e0 jet d&#039;encre sur des papiers d&#039;\u00e9preuves sp\u00e9ciaux.\" class=\"encyclopedia\">\u00c9preuves num\u00e9riques<\/a> \u00e0 base d'encre s'est impos\u00e9e dans le domaine de l'\u00e9preuve. Comme l'impression se fait \u00e0 l'encre, il faut utiliser un papier couch\u00e9 sp\u00e9cial qui ne ressemble en rien \u00e0 celui qui sera utilis\u00e9 plus tard pour le tirage. Si vous avez d\u00e9j\u00e0 essay\u00e9 d'imprimer sur du papier couch\u00e9 brillant avec une imprimante \u00e0 jet d'encre, vous savez que l'encre ne tient jamais ! C'est pourquoi le m\u00e9tam\u00e9risme est toujours en jeu lorsqu'une \u00e9preuve est imprim\u00e9e avec un <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/impression-offset-2\/\" target=\"_self\" title=\"L&#039;impression offset est un proc\u00e9d\u00e9 d&#039;impression indirect. Indirecte signifie que la forme d&#039;impression et le support d&#039;impression ne sont pas en contact direct l&#039;un avec l&#039;autre, mais qu&#039;un m\u00e9dia est utilis\u00e9 entre les deux comme moyen de transmission. C&#039;est le proc\u00e9d\u00e9 d&#039;impression le plus r\u00e9pandu. Il existe : - des presses offset \u00e0 feuilles et - des presses offset \u00e0 bobines.\" class=\"encyclopedia\">Impression offset<\/a> doit \u00eatre compar\u00e9e.<\/p>\n<p>Il est particuli\u00e8rement important de savoir sous quel angle l'\u00e9preuve et le tirage sont consid\u00e9r\u00e9s.<\/p>\n<p>La norme ISO 3664 r\u00e9git l'\u00e9clairage normalis\u00e9 n\u00e9cessaire \u00e0 l'observation des <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/proofs\/\" target=\"_self\" title=\"Dans le domaine de l&#039;impression, les \u00e9preuves d\u00e9signent la simulation d&#039;un r\u00e9sultat d&#039;impression en couleurs et juridiquement contraignante \u00e0 des fins de contr\u00f4le. La norme responsable des \u00e9preuves est la norme ISO 12647-7:2016, donc dans sa r\u00e9vision actuelle de 2016.\" class=\"encyclopedia\">\u00c9preuves<\/a> et l'impression est importante. Dans ce contexte, le <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/d50\/\" target=\"_self\" title=\"D50 est la lumi\u00e8re standard de l&#039;industrie de l&#039;impression. Seule la lumi\u00e8re standard D50 permet de r\u00e9aliser des \u00e9preuves aux couleurs fid\u00e8les,\" class=\"encyclopedia\">D50<\/a> et non plus D50 : ces derni\u00e8res ann\u00e9es, la Commission internationale de l'\u00e9clairage (CIE) a r\u00e9vis\u00e9 la norme ISO 3664 pour l'adapter aux circonstances actuelles. Si les UV \u00e9taient autrefois strictement interdits, ils font d\u00e9sormais partie de la norme. En effet, la conformit\u00e9 de la diapositive et du tirage \u00e9tait autrefois primordiale, alors qu'aujourd'hui, c'est le moniteur, <a href=\"https:\/\/proof.proofen.de\/fr\/lexique-9\/digitalproof\/\" target=\"_self\" title=\"Une \u00e9preuve num\u00e9rique (correctement appel\u00e9e \u00e9preuve contractuelle ou en anglais Contract Proof) est un moyen de contr\u00f4le certifi\u00e9 selon la norme ISO 12647-7 pour l&#039;industrie graphique. Une \u00e9preuve num\u00e9rique simule la colorim\u00e9trie de l&#039;impression offset ou de l&#039;h\u00e9liogravure en respectant les couleurs et les tol\u00e9rances strictes de la norme ISO.\" class=\"encyclopedia\">\u00c9preuve num\u00e9rique<\/a> et l'impression offset sont importantes. C'est pourquoi les \u00e9preuves doivent toujours \u00eatre consid\u00e9r\u00e9es sous D50 Normale, afin que leur perception soit r\u00e9ellement \"fid\u00e8le\" aux couleurs.<\/p>\n<p>Pour ceux qui souhaitent v\u00e9rifier les effets de m\u00e9tam\u00e9risme, nous vous invitons \u00e0 consulter le<a title=\"Indicateur de temp\u00e9rature de couleur UGRA\" href=\"https:\/\/www.ugra.ch\/produkt\/ugra-light-indicator-strip-d50\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Indicateur de lumi\u00e8re UGRA<\/a> sont recommand\u00e9es. Ces bandes permettent de v\u00e9rifier tr\u00e8s rapidement et clairement les effets de m\u00e9tam\u00e9risme.<\/p>","protected":false},"excerpt":{"rendered":"<p>La qualit\u00e9 d'une \u00e9preuve d\u00e9pend de l'\u00e9clairage sous lequel on la regarde. Le simple fait de s'approcher de la fen\u00eatre ou d'allumer la lumi\u00e8re \u00e0 la tomb\u00e9e de la nuit ne sert \u00e0 rien : \u00e0 la fen\u00eatre, entre d\u00e9cembre et juillet, entre 8 heures du matin et 8 heures du soir, entre le nuageux et l'ensoleill\u00e9, il y a une \u00e9norme diff\u00e9rence d'\u00e9clairage qui rend impossible toute \u00e9valuation des couleurs. Et si vous allumez la lumi\u00e8re, vous allumez g\u00e9n\u00e9ralement une ampoule de 2700 kelvins - ou pire encore : une ampoule \u00e0 \u00e9conomie d'\u00e9nergie qui brille dans n'importe quel spectre ... une catastrophe ! \u00c0 l'impression ... <\/p>\n<p class=\"read-more-container\"><a title=\"Lumi\u00e8re normale et effet de m\u00e9tam\u00e9risme\" class=\"read-more button\" href=\"https:\/\/proof.proofen.de\/fr\/normlicht-d50-oder-d50-oder-was\/#more-107\" aria-label=\"Read more about Normlicht und Metamerie-Effekt\">Lire la suite<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[18,25,437,7,442],"tags":[533,277,1054,551,47,525],"class_list":["post-107","post","type-post","status-publish","format-standard","hentry","category-haufige-fragen","category-licht-und-normlicht","category-proof-software-und-technik","category-proof-wissen","category-prozessstandard-offsetdruck-proof-wissen","tag-d50","tag-farbtemperatur","tag-farbtemperatur-indikator","tag-metamerie","tag-normlicht-2","tag-ugra","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","no-featured-image-padding"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Unter welchen Lichtbedingungen muss ein Proof eigentlich betrachtet werden? 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