{"id":7265,"date":"2025-11-27T15:40:09","date_gmt":"2025-11-27T14:40:09","guid":{"rendered":"https:\/\/www.afe-eclairage.fr\/?p=7265"},"modified":"2025-11-27T15:41:08","modified_gmt":"2025-11-27T14:41:08","slug":"irc-cct-les-couleurs-ont-des-choses-a-dire-les-reponses","status":"publish","type":"post","link":"https:\/\/www.afe-eclairage.fr\/?p=7265","title":{"rendered":"IRC, CCT&#8230; les couleurs ont des choses \u00e0 dire ! &#8211; les r\u00e9ponses"},"content":{"rendered":"\n<div style=\"height:58px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><a href=\"https:\/\/www.afe-eclairage.fr\/wp-content\/uploads\/2025\/11\/Posters-ateliers-JNL2025-CIE-France.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><span style=\"text-decoration: underline;\">Cliquez ici pour consulter les posters CIE France. <\/span><\/a><\/p>\n\n\n\n<div style=\"height:28px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Pour le poster CCT :<\/p>\n\n\n\n<p><strong>En quelle unit\u00e9 s\u2019exprime la temp\u00e9rature de couleur ?<\/strong><\/p>\n\n\n\n<p>Kelvin K<\/p>\n\n\n\n<p><strong>Deux sources ayant la m\u00eame temp\u00e9rature de couleur ont-elles forc\u00e9ment la m\u00eame teinte\u00a0?<\/strong><\/p>\n\n\n\n<p>Non il y a l\u2019influence du Duv<\/p>\n\n\n\n<p><strong>A-t-on le m\u00eame rendu des couleurs si on a la m\u00eame temp\u00e9rature de couleur\u00a0?<\/strong><\/p>\n\n\n\n<p>Non le rendu des couleurs ne d\u00e9pend pas uniquement de la temp\u00e9rature mais aussi de l\u2019IRC et de la distribution spectrale de la source<\/p>\n\n\n\n<p><strong>Une lumi\u00e8re de 2700 K est g\u00e9n\u00e9ralement per\u00e7ue comme :<\/strong><br>a) <strong>Chaude<\/strong><br>b) Neutre<br>c) Froide<\/p>\n\n\n\n<p><strong>Plus la temp\u00e9rature de couleur est \u00e9lev\u00e9e, plus la lumi\u00e8re para\u00eet\u2026<\/strong><br>a) Jaune<br>b) <strong>Bleue<\/strong><br>c) Rouge<\/p>\n\n\n\n<p><strong>Une lampe \u00ab lumi\u00e8re du jour \u00bb se situe g\u00e9n\u00e9ralement autour de :<\/strong><br>a) 1000 K<br>b) 4000 K<br>c) <strong>6500<\/strong> K<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Pour le poster IRC :<\/strong><\/p>\n\n\n\n<p><strong>La temp\u00e9rature de couleur permet-elle de qualifier le rendu des couleurs\u00a0?<\/strong><\/p>\n\n\n\n<p>Non c\u2019est l\u2019IRC qui caract\u00e9rise le rendu des couleurs avec influence de la distribution spectrale de la source<\/p>\n\n\n\n<p><strong>Que signifie le sigle IRC ?<\/strong><\/p>\n\n\n\n<p>Indice de rendu des couleurs<\/p>\n\n\n\n<p><strong>\u00c0 partir de quelle valeur consid\u00e8re-t-on qu\u2019un IRC est bon pour un usage g\u00e9n\u00e9ral ?<\/strong><\/p>\n\n\n\n<p>80<\/p>\n\n\n\n<p><strong>Un \u00e9clairage avec un IRC \u00e9lev\u00e9 consomme forc\u00e9ment plus d\u2019\u00e9nergie\u00a0?<\/strong><\/p>\n\n\n\n<p>Non<\/p>\n\n\n\n<p><strong>Quelle est la diff\u00e9rence entre Ra (IRC standard) et R9 ?<\/strong><\/p>\n\n\n\n<p>Ra repr\u00e9sente l\u2019indice g\u00e9n\u00e9ral de rendu des couleur calcul\u00e9 sur 8 couleurs et R9 est calcul\u00e9 uniquement sur le rouge<\/p>\n\n\n\n<p><strong>Quelle m\u00e9thode internationale r\u00e9cente compl\u00e8te ou remplace l\u2019IRC pour mieux d\u00e9crire la qualit\u00e9 des couleurs ?<\/strong><\/p>\n\n\n\n<p>Rf recommand\u00e9 par la CIE en 2017 et IES-TM30 recommand\u00e9 aux Etats-Unis<\/p>\n\n\n\n<p><strong>Deux sources ayant le m\u00eame IRC peuvent-elle avoir des rendus des couleurs diff\u00e9rents\u00a0?<\/strong><\/p>\n\n\n\n<p>Oui car l\u2019IRC est un nombre unique qui ne quantifie pas toutes les variations spectrales.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cliquez ici pour consulter les posters CIE France. Pour le poster CCT : En quelle unit\u00e9 s\u2019exprime la temp\u00e9rature de couleur ? Kelvin K Deux sources<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/posts\/7265"}],"collection":[{"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7265"}],"version-history":[{"count":2,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/posts\/7265\/revisions"}],"predecessor-version":[{"id":7277,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=\/wp\/v2\/posts\/7265\/revisions\/7277"}],"wp:attachment":[{"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.afe-eclairage.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}