{"id":101758,"date":"2019-07-19T12:17:29","date_gmt":"2019-07-19T10:17:29","guid":{"rendered":"http:\/\/riverdi.com\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\/"},"modified":"2024-05-20T11:04:37","modified_gmt":"2024-05-20T09:04:37","slug":"pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents","status":"publish","type":"post","link":"https:\/\/riverdi.com\/fr\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents","title":{"rendered":"Pourquoi la correction gamma est-elle n\u00e9cessaire, m\u00eame pour les \u00e9crans intelligents ?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #002175;color:#002175\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #002175;color:#002175\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/riverdi.com\/fr\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\/#Codage_gamma_decodage_gamma_compression_expansion_%E2%80%93_quest-ce_que_cest\" >Codage gamma, d\u00e9codage gamma, compression, expansion &#8211; qu&rsquo;est-ce que c&rsquo;est ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/riverdi.com\/fr\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\/#Dois-je_me_preoccuper_de_la_correction_gamma_de_laffichage_dans_mon_projet\" >Dois-je me pr\u00e9occuper de la correction gamma de l&rsquo;affichage dans mon projet ?<\/a><\/li><\/ul><\/nav><\/div>\n<p>Ceci <a href=\"https:\/\/riverdi.com\/category\/display-101\"><br \/>\n  <strong>Affichage 101<\/strong><br \/>\n<\/a><strong> explique<\/strong> les bases de la correction gamma de l&rsquo;affichage. Pour ce faire, nous devons vous pr\u00e9senter le contexte de la correction gamma appliqu\u00e9e \u00e0 l&rsquo;\u00e9cran. Il s&rsquo;agit en fait du traitement du signal n\u00e9cessaire \u00e0 l&rsquo;affichage du contenu sur les modules LCD.<\/p>\n<p>Curieusement, nous commencerons par la biologie humaine. Pour \u00eatre exact, les yeux.<\/p>\n<p>L&rsquo;\u0153il humain est un organe complexe. Il est utile de conna\u00eetre quelques faits sur la fa\u00e7on dont l&rsquo;\u0153il traite les informations. L&rsquo;\u00e9volution a fa\u00e7onn\u00e9 l&rsquo;\u0153il humain moderne pendant des milliers d&rsquo;ann\u00e9es. Il existe de nombreuses astuces pour obtenir le meilleur effet possible. Un bon exemple est le fait que <strong>nos yeux ne sont pas tr\u00e8s sensibles aux changements dans les zones de couleur claire, mais qu&rsquo;ils peuvent tr\u00e8s facilement rep\u00e9rer les changements dans un environnement sombre<\/strong>.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/figure-1.jpg\"><img decoding=\"async\" class=\"wp-image-7956 size-full aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/figure-1.jpg\" alt=\"\" width=\"700\" height=\"174\"><\/a><\/p>\n<p>La diff\u00e9rence d&rsquo;\u00e9mission d&rsquo;\u00e9nergie lumineuse entre les \u00e9tapes (barres) varie constamment de gauche \u00e0 droite.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/figure-2.jpg\"><img decoding=\"async\" class=\"wp-image-7955 size-full aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/figure-2.jpg\" alt=\"\" width=\"700\" height=\"174\"><\/a><\/p>\n<p>La deuxi\u00e8me image est-elle plus homog\u00e8ne ?<\/p>\n<p>C&rsquo;est certain.<\/p>\n<p>Pourquoi ?<\/p>\n<p>La r\u00e9ponse se trouve dans nos yeux. La <strong>r\u00e9ponse des yeux humains \u00e0 l&rsquo;intensit\u00e9 lumineuse n&rsquo;est pas lin\u00e9aire<\/strong>. C&rsquo;est pourquoi la deuxi\u00e8me image (Fig.2) &#8211; o\u00f9 le changement suit une relation de type loi de puissance &#8211; est per\u00e7ue comme plus r\u00e9guli\u00e8re.<\/p>\n<p>En raison de cet effet, nous avons besoin du <strong>transfert de gamma<\/strong> de l&rsquo;\u00e9cran.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Codage_gamma_decodage_gamma_compression_expansion_%E2%80%93_quest-ce_que_cest\"><\/span><strong>Codage gamma, d\u00e9codage gamma, compression, expansion <\/strong><strong>&#8211; qu&rsquo;est-ce que c&rsquo;est ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Il existe un grand nombre d&rsquo;expressions li\u00e9es \u00e0 la correction gamma \u00e0 l&rsquo;\u00e9cran, nous allons donc en clarifier certaines :<\/p>\n<ul>\n<li>Le <strong>codage gamma<\/strong> (ou compression gamma) est le processus de conversion des valeurs de l&rsquo;espace lin\u00e9aire en gamma.<\/li>\n<li>Le <strong>d\u00e9codage gamma<\/strong> (ou expansion gamma) est l&rsquo;inverse du processus susmentionn\u00e9. C&rsquo;est le processus de conversion des valeurs de l&rsquo;espace en lin\u00e9aire.<\/li>\n<\/ul>\n<p>Regardez l&rsquo;intrigue :<\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/gamma-correction-1.jpg\"><img decoding=\"async\" class=\"wp-image-7958 size-full aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/gamma-correction-1.jpg\" alt=\"\" width=\"388\" height=\"379\"><\/a><\/p>\n<p><em>     <span style=\"color: #808080\">rouge &#8211; correction gamma de l&rsquo;affichage<br \/>\n<\/span><\/em><\/p>\n<p><span style=\"color: #808080\"><em>  jaune &#8211; fonction lin\u00e9aire de la luminosit\u00e9<\/em><\/span><\/p>\n<p>Les nuances individuelles des canaux RVB ne changent pas selon une valeur fixe, mais sont affich\u00e9es selon une courbe qui est une fonction de puissance.<\/p>\n<p>Si une couleur est affich\u00e9e avec la fonction jaune (lin\u00e9aire) (voir image ci-dessus), de nombreux d\u00e9tails des zones sombres seront perdus. Il n&rsquo;y aurait pas non plus de moyen de remarquer les diff\u00e9rences dans les couleurs claires.<\/p>\n<p>La correction gamma de l&rsquo;\u00e9cran nous permet d&rsquo;ajuster le mat\u00e9riel pour obtenir la meilleure r\u00e9ception visuelle.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/linear-raw-image.jpg\"><img decoding=\"async\" class=\"alignnone wp-image-7953 size-full\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/linear-raw-image.jpg\" alt=\"\" width=\"422\" height=\"290\"><\/a> <a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/gamma-correction-image.jpg\"><img decoding=\"async\" class=\"alignnone wp-image-7954 size-full\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/gamma-correction-image.jpg\" alt=\"\" width=\"422\" height=\"290\"><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Dois-je_me_preoccuper_de_la_correction_gamma_de_laffichage_dans_mon_projet\"><\/span>Dois-je me pr\u00e9occuper de la correction gamma de l&rsquo;affichage dans mon projet ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Nous esp\u00e9rons que toute cette physique ne vous a pas d\u00e9tourn\u00e9 de ce sujet.<\/p>\n<p>Ne vous inqui\u00e9tez pas, la correction gamma de l&rsquo;affichage est d\u00e9j\u00e0 appliqu\u00e9e dans le contr\u00f4leur LCD. La question de la perception de l&rsquo;image est donc d\u00e9j\u00e0 r\u00e9gl\u00e9e.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans cet article sur l&rsquo;affichage 101, nous aimerions vous pr\u00e9senter le traitement du signal qui sous-tend l&rsquo;affichage de contenu sur des modules LCD et, en bref, vous expliquer la correction gamma.<\/p>\n","protected":false},"author":19,"featured_media":100219,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[1457],"tags":[1405,4713,945,946],"class_list":["post-101758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-affichage-101","tag-affichage-101-2","tag-affichage-101-fr","tag-correction-gamma","tag-lumiere"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pourquoi la correction gamma est-elle n\u00e9cessaire, m\u00eame pour les \u00e9crans intelligents ? - Riverdi<\/title>\n<meta name=\"description\" content=\"Dans cet article Display 101, nous aimerions vous pr\u00e9senter quelques notions de traitement du signal et, en bref, expliquer la correction gamma.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/riverdi.com\/fr\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pourquoi la correction gamma est-elle n\u00e9cessaire, m\u00eame pour les \u00e9crans intelligents ? - Riverdi\" \/>\n<meta property=\"og:description\" content=\"Dans cet article Display 101, nous aimerions vous pr\u00e9senter quelques notions de traitement du signal et, en bref, expliquer la correction gamma.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/riverdi.com\/fr\/blog\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\" \/>\n<meta property=\"og:site_name\" content=\"Riverdi\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/riverdi.displays\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-07-19T10:17:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-20T09:04:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/riverdi.com\/wp-content\/uploads\/2019\/07\/gamma-correction.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1140\" \/>\n\t<meta property=\"og:image:height\" content=\"570\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"luke\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@riverdidisplays\" \/>\n<meta name=\"twitter:site\" content=\"@riverdidisplays\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"luke\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\"},\"author\":{\"name\":\"luke\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr#\\\/schema\\\/person\\\/c60248725c475e979d6ded462884c702\"},\"headline\":\"Pourquoi la correction gamma est-elle n\u00e9cessaire, m\u00eame pour les \u00e9crans intelligents ?\",\"datePublished\":\"2019-07-19T10:17:29+00:00\",\"dateModified\":\"2024-05-20T09:04:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\"},\"wordCount\":510,\"image\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/riverdi.com\\\/wp-content\\\/uploads\\\/2019\\\/07\\\/gamma-correction.webp\",\"keywords\":[\"Affichage 101\",\"Affichage 101\",\"Correction gamma\",\"lumi\u00e8re\"],\"articleSection\":[\"Affichage 101\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\",\"url\":\"https:\\\/\\\/riverdi.com\\\/fr\\\/blog\\\/pourquoi-la-correction-gamma-est-elle-necessaire-meme-pour-les-ecrans-intelligents\",\"name\":\"Pourquoi la correction gamma est-elle n\u00e9cessaire, m\u00eame pour les \u00e9crans intelligents ? 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