{"id":1251,"date":"2025-08-27T12:19:00","date_gmt":"2025-08-27T10:19:00","guid":{"rendered":"https:\/\/lamama.fr\/blog\/?p=1251"},"modified":"2026-05-05T10:59:32","modified_gmt":"2026-05-05T08:59:32","slug":"le-rec-709","status":"publish","type":"post","link":"https:\/\/lamama.fr\/blog\/le-rec-709\/","title":{"rendered":"Le REC 709"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\ud83d\udcfa Tout savoir sur le Rec. 709<\/h1>\n\n\n\n<p>Vous avez entendu parler de LOG, de RAW\u2026 mais que se passe-t-il lorsqu\u2019on revient \u00e0 la base ? Le&nbsp;<strong>Rec. 709<\/strong>&nbsp;(aussi appel\u00e9&nbsp;<strong>BT.709<\/strong>) est le&nbsp;<strong>standard de couleur<\/strong>&nbsp;le plus r\u00e9pandu pour la t\u00e9l\u00e9vision HD et les contenus SDR (Standard Dynamic Range). Si vous regardez une vid\u00e9o sur une t\u00e9l\u00e9, un \u00e9cran d\u2019ordi ou un smartphone non HDR, il y a de grandes chances qu\u2019elle utilise ce profil.<\/p>\n\n\n\n<p>C\u2019est le format le plus \u201cconforme\u201d aux \u00e9crans du quotidien, l\u00e0 o\u00f9 LOG et RAW offrent des latitudes de post-production. C\u2019est aussi ce qui conclut logiquement notre s\u00e9rie apr\u00e8s&nbsp;<a href=\"https:\/\/lamama.fr\/filmer-en-log\/\">filmer en LOG<\/a>&nbsp;et&nbsp;<a href=\"https:\/\/lamama.fr\/filmer-en-raw\/\">filmer en RAW<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcd0 Les fondamentaux du Rec. 709<\/h2>\n\n\n\n<p>Rec. 709 est l\u2019abr\u00e9viation de \u00ab&nbsp;<strong>ITU-R Recommendation BT.709<\/strong>\u00ab&nbsp;, d\u00e9finie par l\u2019Union internationale des t\u00e9l\u00e9communications. Il s\u2019agit d\u2019un&nbsp;<strong>standard vid\u00e9o<\/strong>&nbsp;mis en place dans les ann\u00e9es 1990 pour uniformiser la diffusion&nbsp;<strong>HD<\/strong>.<\/p>\n\n\n\n<p>Il sp\u00e9cifie plusieurs param\u00e8tres techniques, dont :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udfe5\ud83d\udfe9\ud83d\udfe6\u00a0<strong>l\u2019espace colorim\u00e9trique<\/strong>\u00a0(plus restreint que le DCI-P3 ou Rec.2020)<\/li>\n\n\n\n<li>\ud83c\udf2b\ufe0f\u00a0<strong>la courbe gamma<\/strong><\/li>\n\n\n\n<li>\ud83d\udda5\ufe0f\u00a0<strong>la r\u00e9solution<\/strong>, la\u00a0<strong>fr\u00e9quence d\u2019image<\/strong>\u00a0ou la\u00a0<strong>profondeur de bits<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Bref, tout ce qu\u2019il faut pour qu\u2019un programme s\u2019affiche correctement sur un \u00e9cran standardis\u00e9, quel qu\u2019il soit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83c\udf08 L\u2019espace colorim\u00e9trique<\/h3>\n\n\n\n<p>Le Rec. 709 d\u00e9finit un espace de couleur bas\u00e9 sur trois primaires :&nbsp;<strong>rouge, vert et bleu<\/strong>, avec un&nbsp;<strong>point blanc D65<\/strong>&nbsp;(\u00e9quivalent \u00e0 la lumi\u00e8re du jour).<\/p>\n\n\n\n<p>Sa couverture est d\u2019environ&nbsp;<strong>35,9 % du spectre visible<\/strong>&nbsp;\u2013 bien moins \u00e9tendue que celle du Rec. 2020 ou d\u2019un fichier RAW, mais suffisante pour une diffusion TV ou web classique.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>C\u2019est une bonne base quand vous ne cherchez pas \u00e0 faire d\u2019\u00e9talonnage pouss\u00e9 ou d\u2019effets stylis\u00e9s.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83c\udf12 Le Gamma et la luminosit\u00e9<\/h3>\n\n\n\n<p>Rec. 709 adopte une&nbsp;<strong>courbe gamma d\u2019environ 2.2<\/strong>&nbsp;pour l\u2019encodage, et&nbsp;<strong>2.4 pour l\u2019affichage<\/strong>, selon la recommandation BT.1886.<\/p>\n\n\n\n<p>Cela permet une&nbsp;<strong>restitution fluide des d\u00e9grad\u00e9s<\/strong>&nbsp;et des&nbsp;<strong>valeurs de lumi\u00e8re naturelle<\/strong>, bien que moins pr\u00e9cise que ce que permet un fichier LOG ou RAW. Pour les curieux, on parle ici de&nbsp;<strong>OETF<\/strong>&nbsp;(transform\u00e9e de transfert opto-\u00e9lectronique) et&nbsp;<strong>EOTF<\/strong>&nbsp;(\u00e9lectro-optique), qui r\u00e9gissent la fa\u00e7on dont l\u2019image est enregistr\u00e9e puis affich\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83c\udfaf Pourquoi Rec. 709 est-il si important ?<\/h2>\n\n\n\n<p>Imaginez recevoir une pub \u00e0 la t\u00e9l\u00e9, la voir diff\u00e9remment sur YouTube et encore autrement sur votre tablette. Sans standard comme le Rec.709, c\u2019est ce qui arriverait. Cette norme assure&nbsp;<strong>une coh\u00e9rence des couleurs et du rendu<\/strong>&nbsp;entre les cam\u00e9ras, les \u00e9crans de montage, les t\u00e9l\u00e9viseurs, les plateformes.<\/p>\n\n\n\n<p>Elle permet aussi de&nbsp;<strong>travailler vite et efficacement<\/strong>, car l\u2019image est d\u00e9j\u00e0 conforme \u00e0 sa diffusion finale. C\u2019est un format pr\u00eat \u00e0 l\u2019emploi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Domaines d\u2019application<\/h3>\n\n\n\n<p>Voici les contextes o\u00f9 Rec.709 est la r\u00e9f\u00e9rence :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcfa\u00a0<strong>T\u00e9l\u00e9vision HD<\/strong>\u00a0(pubs, reportages, \u00e9missions)<\/li>\n\n\n\n<li>\ud83c\udf10\u00a0<strong>Streaming SDR<\/strong>\u00a0(YouTube, Vimeo, r\u00e9seaux sociaux\u2026)<\/li>\n\n\n\n<li>\ud83d\udcbf\u00a0<strong>Blu-ray \/ DVD<\/strong><\/li>\n\n\n\n<li>\ud83c\udf9e\ufe0f\u00a0<strong>Montage vid\u00e9o professionnel<\/strong>\u00a0(quand il n\u2019y a pas de besoin de grande latitude de correction)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Visitvar - spot TV 2021\" width=\"696\" height=\"392\" src=\"https:\/\/www.youtube.com\/embed\/DER7M8gUOVE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/lamama.fr\/production-video\/visit-var-spot-tv-tourisme\/\">Voir le projet<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83c\udd9a Rec. 709 face aux nouvelles normes<\/h2>\n\n\n\n<p>Avec l\u2019arriv\u00e9e des \u00e9crans HDR, du Rec. 2020 et du DCI-P3, on pourrait croire que Rec. 709 est obsol\u00e8te. Pourtant,&nbsp;<strong>il reste le standard dominant<\/strong>, car :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La majorit\u00e9 des \u00e9crans le supportent nativement<\/li>\n\n\n\n<li>Les workflows sont plus simples<\/li>\n\n\n\n<li>Tous les logiciels le g\u00e8rent parfaitement<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>M\u00eame en 2025, Rec. 709 reste pertinent pour la majorit\u00e9 des contenus diffus\u00e9s.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddea Quelle diff\u00e9rence entre REC709, LOG et RAW ?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Format<\/th><th>Latitude en post-prod<\/th><th>Fid\u00e9lit\u00e9 couleur directe<\/th><th>Besoin d\u2019\u00e9talonnage<\/th><th>Poids fichiers<\/th><\/tr><tr><td>Rec.709<\/td><td>\u274c Faible<\/td><td>\u2705 \u00c9lev\u00e9e<\/td><td>\u274c Non<\/td><td>\u2705 L\u00e9ger<\/td><\/tr><tr><td>LOG<\/td><td>\u2705 Moyenne<\/td><td>\u274c Plate volontairement<\/td><td>\u2705 Oui<\/td><td>\u2696\ufe0f Moyen<\/td><\/tr><tr><td>RAW<\/td><td>\u2705\u2705 Tr\u00e8s \u00e9lev\u00e9e<\/td><td>\u274c Brut sans traitement<\/td><td>\u2705\u2705 Oui +<\/td><td>\u274c Lourd<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udc49 Consultez nos articles d\u00e9taill\u00e9s :&nbsp;<a href=\"https:\/\/lamama.fr\/filmer-en-log\/\">Filmer en LOG<\/a>&nbsp;\/&nbsp;<a href=\"https:\/\/lamama.fr\/filmer-en-raw\/\">Filmer en RAW<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\uddd1\u200d\ud83d\udcbc Rec. 709 dans les flux de travail pros<\/h2>\n\n\n\n<p>Dans les studios, agences et cha\u00eenes TV, Rec. 709 reste une&nbsp;<strong>r\u00e9f\u00e9rence incontournable<\/strong>. Il permet de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Calibrer les \u00e9crans de travail pour une\u00a0<strong>conformit\u00e9 couleur assur\u00e9e<\/strong><\/li>\n\n\n\n<li>Monter et exporter sans se perdre dans des courbes de correction<\/li>\n\n\n\n<li>Travailler vite sur des projets diffus\u00e9s en HD ou SDR (clips, films institutionnels, formats courts\u2026)<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Chez&nbsp;<a href=\"https:\/\/lamama.fr\/le-tournage-video\/\">La Mama<\/a>, nous l\u2019utilisons r\u00e9guli\u00e8rement pour les spots TV, les formats YouTube ou les vid\u00e9os sociales o\u00f9 l\u2019objectif est un rendu professionnel imm\u00e9diat.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udcfa Tout savoir sur le Rec. 709 Vous avez entendu parler de LOG, de RAW\u2026 mais que se passe-t-il lorsqu\u2019on revient \u00e0 la base ? Le&nbsp;Rec. 709&nbsp;(aussi appel\u00e9&nbsp;BT.709) est le&nbsp;standard de couleur&nbsp;le plus r\u00e9pandu pour la t\u00e9l\u00e9vision HD et les contenus SDR (Standard Dynamic Range). Si vous regardez une vid\u00e9o sur une t\u00e9l\u00e9, un \u00e9cran [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1252,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":{"0":"post-1251","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-etude-de-cas"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rec 709 \/ BT 709 : comprendre ce standard et quand l&#039; utiliser<\/title>\n<meta name=\"description\" content=\"Rec.709 : d\u00e9couvrez ce standard essentiel pour la vid\u00e9o HD et le streaming SDR, et comprenez ses diff\u00e9rences face aux profils LOG et RAW.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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