{"id":224,"date":"2025-06-28T08:52:51","date_gmt":"2025-06-28T06:52:51","guid":{"rendered":"https:\/\/ecriture-numerique.fr\/?p=224"},"modified":"2025-06-28T08:56:48","modified_gmt":"2025-06-28T06:56:48","slug":"impressions-ratios","status":"publish","type":"post","link":"https:\/\/ecriture-numerique.fr\/index.php\/2025\/06\/28\/impressions-ratios\/","title":{"rendered":"Impressions &amp; ratios"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Voici un <strong>r\u00e9pertoire clair et pratique<\/strong> des formats d\u2019image les plus courants (en pixels), associ\u00e9s \u00e0 leurs <strong>ratios d\u2019aspect<\/strong>, <strong>usages<\/strong> typiques (print\/web), et <strong>conseils pour l\u2019impression haute qualit\u00e9<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ratios d\u2019aspect et dimensions recommand\u00e9es (pixels)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les dimensions ci-dessous sont donn\u00e9es \u00e0 titre indicatif pour un usage <strong>HD (300 dpi pour le print, 72-150 dpi pour le web)<\/strong>. On peut toujours adapter les dimensions selon les besoins, mais garder les proportions du ratio.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Ratio<\/th><th>Dimensions recommand\u00e9es<\/th><th>Usage courant<\/th><\/tr><\/thead><tbody><tr><td><strong>1:1<\/strong><\/td><td>1080\u00d71080, 3000\u00d73000<\/td><td>Posts Instagram, vignettes, logos<\/td><\/tr><tr><td><strong>9:16<\/strong><\/td><td>1080\u00d71920, 720\u00d71280<\/td><td>Stories, Reels, TikTok, affiches verticales<\/td><\/tr><tr><td><strong>16:9<\/strong><\/td><td>1920\u00d71080, 3840\u00d72160<\/td><td>Vid\u00e9os YouTube, \u00e9crans, pr\u00e9sentations<\/td><\/tr><tr><td><strong>4:3<\/strong><\/td><td>1600\u00d71200, 2048\u00d71536<\/td><td>Photos classiques, PowerPoint, documents<\/td><\/tr><tr><td><strong>3:4<\/strong><\/td><td>1080\u00d71440, 1500\u00d72000<\/td><td>Affiches verticales, posters<\/td><\/tr><tr><td><strong>2:3<\/strong><\/td><td>2000\u00d73000, 2400\u00d73600<\/td><td>Photographie imprim\u00e9e (10x15cm), flyers<\/td><\/tr><tr><td><strong>3:2<\/strong><\/td><td>3000\u00d72000<\/td><td>Cartes postales, tirages photo<\/td><\/tr><tr><td><strong>5:4<\/strong><\/td><td>2500\u00d72000<\/td><td>Portraits, impressions carr\u00e9es<\/td><\/tr><tr><td><strong>21:9<\/strong><\/td><td>2560\u00d71080, 3440\u00d71440<\/td><td>Banni\u00e8res cin\u00e9ma, \u00e9cran ultra-large<\/td><\/tr><tr><td><strong>DIN A (ISO 216)<\/strong><\/td><td>A4 : 2480\u00d73508 (300 dpi)<\/td><td>Flyers, affiches, supports imprim\u00e9s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Pour l&rsquo;impression haute qualit\u00e9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2192 <strong>Meilleures pratiques<\/strong> :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>R\u00e9solution minimale recommand\u00e9e<\/strong> :\n<ul class=\"wp-block-list\">\n<li><strong>300 dpi (points par pouce)<\/strong> pour le print<\/li>\n\n\n\n<li><strong>150 dpi<\/strong> minimum si tr\u00e8s grand format vu de loin (exposition, kak\u00e9mono)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Format CMJN<\/strong> (cyan, magenta, jaune, noir) pour l\u2019impression, contrairement au RVB utilis\u00e9 \u00e0 l\u2019\u00e9cran.<\/li>\n\n\n\n<li><strong>Formats d\u2019export recommand\u00e9s<\/strong> : PDF, TIFF, PNG 300 dpi.<\/li>\n\n\n\n<li><strong>Laisser un fond perdu (bleed)<\/strong> : g\u00e9n\u00e9ralement 3 \u00e0 5 mm pour \u00e9viter les bords blancs.<\/li>\n\n\n\n<li>Pr\u00e9voir <strong>des marges de s\u00e9curit\u00e9<\/strong> pour que le texte ne soit pas coup\u00e9.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Sites\/outils gratuits pour agrandissement sans perte de qualit\u00e9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Voici des solutions gratuites (ou avec freemium) utilisant <strong>l\u2019IA pour l\u2019upscaling<\/strong> :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2192 <strong>Outils recommand\u00e9s<\/strong> :<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Outil<\/th><th>Atouts<\/th><th>Lien<\/th><\/tr><\/thead><tbody><tr><td><strong>Let&rsquo;s Enhance<\/strong><\/td><td>Upscaling x2 \u00e0 x4, retouche automatique (freemium)<\/td><td><a class=\"\" href=\"https:\/\/letsenhance.io\">letsenhance.io<\/a><\/td><\/tr><tr><td><strong>Upscayl<\/strong> <em>(open source)<\/em><\/td><td>Agrandissement local (pas en ligne), excellent sur Mac\/Linux\/Win<\/td><td><a class=\"\" href=\"https:\/\/upscayl.org\">upscayl.org<\/a><\/td><\/tr><tr><td><strong>Adobe Express<\/strong><\/td><td>Retouche + agrandissement simple, bon pour flyers<\/td><td><a class=\"\" href=\"https:\/\/express.adobe.com\">express.adobe.com<\/a><\/td><\/tr><tr><td><strong>DeepImage.ai<\/strong><\/td><td>IA + traitement par lot, utile pour expo\/photo<\/td><td><a class=\"\" href=\"https:\/\/deep-image.ai\">deep-image.ai<\/a><\/td><\/tr><tr><td><strong>BigJPG<\/strong><\/td><td>Sp\u00e9cialis\u00e9 dans les illustrations et dessins<\/td><td><a class=\"\" href=\"https:\/\/bigjpg.com\">bigjpg.com<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Pour une exposition : conseils sp\u00e9cifiques<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Privil\u00e9gier un format <strong>TIFF ou PDF haute r\u00e9solution<\/strong> avec profil couleur CMJN.<\/li>\n\n\n\n<li>Si agrandissement n\u00e9cessaire, travailler <strong>au double ou triple de la taille finale<\/strong>, puis r\u00e9duire si besoin.<\/li>\n\n\n\n<li>Faire un test A4 avant impression grand format.<\/li>\n\n\n\n<li>Pour l\u2019impression : <strong>imprimerie professionnelle<\/strong>, papier mat \u00e9pais (200-300 g\/m\u00b2) ou papier photo.<\/li>\n\n\n\n<li>Envisager <strong>l\u2019impression sur Dibond, toile ou plexiglas<\/strong> pour un rendu expo sans cadre.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udca1Astuce bonus : Calcul rapide des pixels selon ratio<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pour conna\u00eetre rapidement les dimensions en pixels \u00e0 300 dpi :<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>Largeur en cm x 118 = largeur en px\nHauteur en cm x 118 = hauteur en px\n<\/code>\nExemple : pour un format A3 (29,7 x 42 cm)\n\u2192 29,7 \u00d7 118 \u2248 <strong>3505 px<\/strong> ; 42 \u00d7 118 \u2248 <strong>4956 px<\/strong><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Voici un r\u00e9pertoire clair et pratique des formats d\u2019image les plus courants (en pixels), associ\u00e9s \u00e0 leurs ratios d\u2019aspect, usages typiques (print\/web), et conseils pour l\u2019impression haute qualit\u00e9. Ratios d\u2019aspect et dimensions recommand\u00e9es (pixels) Les dimensions ci-dessous sont donn\u00e9es \u00e0 titre indicatif pour un usage HD (300 dpi pour le print, 72-150 dpi pour le [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":225,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,10],"tags":[],"class_list":["post-224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-creativite","category-productivite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Impressions &amp; ratios - \u00c9criture num\u00e9rique<\/title>\n<meta name=\"description\" content=\"Ratios d\u2019image, formats en pixels et outils gratuits pour imprimer en haute qualit\u00e9 sans perte de nettet\u00e9. 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