{"id":51062,"date":"2023-12-26T10:30:00","date_gmt":"2023-12-26T09:30:00","guid":{"rendered":"https:\/\/graphiste.com\/blog\/?p=51062"},"modified":"2023-12-22T14:00:02","modified_gmt":"2023-12-22T13:00:02","slug":"difference-resolution-definition","status":"publish","type":"post","link":"https:\/\/graphiste.com\/blog\/difference-resolution-definition\/","title":{"rendered":"Quelle est la diff\u00e9rence entre la r\u00e9solution et la d\u00e9finition&nbsp;?"},"content":{"rendered":"\n<p>Qu\u2019il s\u2019agisse de vid\u00e9os ou de photos, il n\u2019y a rien de plus frustrant que de d\u00e9couvrir le fruit de son travail pixelis\u00e9 ou illisible, quel que soit le support. Cela peut venir d\u2019une d\u00e9finition ou d\u2019une r\u00e9solution non appropri\u00e9e.<\/p>\n\n\n\n<p>Un <strong><a href=\"https:\/\/graphiste.com\/\">graphiste freelance<\/a><\/strong> prendra en compte syst\u00e9matiquement les exigences de votre projet pour un rendu net.<\/p>\n\n\n\n<p>Puisqu\u2019il n\u2019est pas rare de confondre les 2 termes, nous \u00e9claircirons ensemble <strong>les notions de \u201cd\u00e9finition\u201d et de \u201cr\u00e9solution\u201d<\/strong> avant de mettre en lumi\u00e8re l\u2019origine de cet amalgame et de d\u00e9couvrir notre astuce pour ne plus commettre d\u2019impair&nbsp;!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La d\u00e9finition&nbsp;: la quantit\u00e9 de pixels<\/h2>\n\n\n\n<p>La d\u00e9finition correspond au nombre de pixels (ou la quantit\u00e9 d\u2019information) d\u2019une image. Celle-ci se calcule en multipliant le nombre de pixels composant la largeur de l\u2019image ou de la dalle par la quantit\u00e9 de ceux pr\u00e9sents sur la hauteur. On obtient ainsi la d\u00e9finition en pixels.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"700\" src=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3.webp\" alt=\"\" class=\"wp-image-51067\" srcset=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3.webp 700w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-300x300.webp 300w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-150x150.webp 150w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-60x60.webp 60w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-370x370.webp 370w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-270x270.webp 270w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-3-570x570.webp 570w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00e9finition et \u00e9crans<\/h3>\n\n\n\n<p>Dans le cas des \u00e9crans, la d\u00e9finition peut \u00eatre qualifi\u00e9e de&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HD (720p)&nbsp;: Haute D\u00e9finition avec 1280 x 720 pixels (soit 921 600 pixels).<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full HD (1080p)&nbsp;: 1920 x 1080 pixels (soit 2 073 600 pixels). Tr\u00e8s utilis\u00e9 ces derni\u00e8res ann\u00e9es pour constituer l\u2019\u00e9cran des smartphones, il est aujourd\u2019hui d\u00e9laiss\u00e9 au profit de d\u00e9finitions plus hautes.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>QHD ou 2K&nbsp;: Quad Haute D\u00e9finition avec 4 fois plus de pixels que la HD, soit 2560 x 1440 (soit 3 686 400 pixels).<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ultra HD (UHD) ou 4K&nbsp;: Avec ses 8 294 400 de pixels (3840 x 2160 pixels), cette d\u00e9finition est pr\u00e9sente sur les \u00e9crans haut de gamme des smartphones, d\u2019ordinateurs et t\u00e9l\u00e9viseurs, notamment ceux de la marque Samsung. Attention \u00e0 ne pas confondre la d\u00e9finition 4K et le \u201cvrai 4K\u201d, une d\u00e9finition 4096 x 2160 pixels destin\u00e9e au cin\u00e9ma.<\/li>\n<\/ul>\n\n\n\n<p>La d\u00e9finition d\u00e9pend \u00e9galement de la technologie de la dalle, LCD ou AMOLED. L\u00e0 o\u00f9 la technologie LCD utilise 3 sous pixels, rouge, vert et bleu (RGB) par pixel, les dalles Samsung AMOLED utilisent la technologie PenTile RGBG, permettant d\u2019atteindre la d\u00e9finition souhait\u00e9e uniquement avec les sous-pixels verts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">La d\u00e9finition dans le monde de l\u2019image<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"310\" src=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2.webp\" alt=\"\" class=\"wp-image-51066\" srcset=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2.webp 700w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2-300x133.webp 300w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2-60x27.webp 60w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2-370x164.webp 370w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2-270x120.webp 270w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-2-570x252.webp 570w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>Une image num\u00e9rique est constitu\u00e9e d\u2019un ensemble de points, les pixels, permettant de la repr\u00e9senter. Le pixel n\u2019a pas de \u201ctaille standard\u201d et repr\u00e9sente en soi une unit\u00e9 d\u2019impression ou d\u2019affichage.<\/p>\n\n\n\n<p>En effet, d\u2019un appareil \u00e0 un autre, la taille physique d\u2019un pixel peut varier de quelques \u00b5m \u00e0 presque 1 cm. La d\u00e9finition ne permet donc pas de conna\u00eetre la taille d\u2019une image, mais bien le nombre de pixels qui la compose. C\u00f4t\u00e9 appareil photo, 2 types capteurs de tailles diff\u00e9rentes peuvent donc avoir une d\u00e9finition identique.<\/p>\n\n\n\n<p>Plus une image contient de pixels, plus celle-ci laissera appara\u00eetre de d\u00e9tails et sera facile \u00e0 travailler sur Photoshop afin de lui donner le cadrage, la nettet\u00e9 et les dimensions voulues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La r\u00e9solution&nbsp;: une surface d\u2019affichage et une concentration de pixels<\/h2>\n\n\n\n<p>Pour <strong>obtenir la r\u00e9solution d\u2019un \u00e9cran<\/strong>, il faut prendre en compte la d\u00e9finition de celui-ci exprim\u00e9e en pixels, divis\u00e9e par la mesure de sa diagonale exprim\u00e9e en inch (pouces). On obtient ainsi un r\u00e9sultat en ppp&nbsp;: Pixel Par Pouce (en anglais ppi&nbsp;: Pixel Per Inch ou dpi&nbsp;: Dot Per Inch), qui correspond \u00e0 la densit\u00e9 de pixels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019importance de la r\u00e9solution pour la vid\u00e9o<\/h3>\n\n\n\n<p><strong>Plus la r\u00e9solution de l\u2019image est importante, plus le confort de lecture et la nettet\u00e9 des d\u00e9tails sont bons<\/strong>. \u00c0 l\u2019inverse, une faible densit\u00e9 de pixels les rendra plus apparents et dispers\u00e9s. L\u2019utilisateur arrivera \u00e0 les discerner plus nettement, ce qui peut nuire \u00e0 son exp\u00e9rience, voire rendre les vid\u00e9os ou images illisibles.<\/p>\n\n\n\n<p>C\u00f4t\u00e9 smartphone, on consid\u00e8re que la r\u00e9solution permettant une qualit\u00e9 de lecture optimale correspond \u00e0 300 dpi, ce qui correspond au terme Retina invent\u00e9 par Apple.<\/p>\n\n\n\n<p>La longueur de la dalle influence directement la r\u00e9solution. Ainsi, pour 2 \u00e9crans de d\u00e9finition identiques, le plus grand aura une r\u00e9solution inf\u00e9rieure. \u00c9galement, plus un \u00e9cran est grand, plus la distance d\u2019observation n\u00e9cessaire \u00e0 l\u2019obtention d\u2019une image nette est importante. C\u2019est pourquoi un professionnel vous demandera les dimensions de la pi\u00e8ce dans laquelle vous souhaitez installer votre t\u00e9l\u00e9viseur, afin de s&#8217;assurer que vous pourrez \u00eatre install\u00e9 \u00e0 bonne distance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L\u2019importance de la r\u00e9solution lors d\u2019une impression<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"583\" src=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition.webp\" alt=\"\" class=\"wp-image-51065\" srcset=\"https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition.webp 700w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-300x250.webp 300w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-60x50.webp 60w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-370x308.webp 370w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-270x225.webp 270w, https:\/\/graphiste.com\/blog\/wp-content\/uploads\/sites\/4\/2023\/08\/difference-resolution-definition-570x475.webp 570w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p>Comme lorsque vous affichez une image sur un \u00e9cran, une impression consiste \u00e0 concentrer toutes les informations de ladite image (d\u00e9finition) sur un support solide (papier, support publicitaire\u2026). Chaque imprimante poss\u00e8de \u00e9galement sa propre r\u00e9solution en fonction de sa technologie (jet d\u2019encre, laser ou sublimation).<\/p>\n\n\n\n<p>Ainsi, l\u2019impression de 2 images de d\u00e9finitions identiques, mais de r\u00e9solutions diff\u00e9rentes, n\u2019occupera pas la m\u00eame surface sur une feuille de papier lors de l\u2019impression. Bien s\u00fbr, vous pourrez effectuer vous-m\u00eame des r\u00e9glages manuellement afin d\u2019obtenir les dimensions et la qualit\u00e9 souhait\u00e9es ou utiliser un logiciel qui proc\u00e9dera lui-m\u00eame aux calculs d\u2019optimisation.<\/p>\n\n\n\n<p>Astuce&nbsp;: le nombre de dpi n\u2019influe pas sur le poids de votre fichier informatique. Celui-ci va surtout d\u00e9pendre de la d\u00e9finition, du type de fichier (Jpeg, TIFF, RAW\u2026) et de sa qualit\u00e9 (ou compression).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi confond-on souvent d\u00e9finition et r\u00e9solution&nbsp;?<\/h2>\n\n\n\n<p>Si les 2 notions sont bien diff\u00e9rentes lorsqu\u2019on prend le temps de les d\u00e9finir s\u00e9par\u00e9ment, la confusion s\u2019est en fait \u00e9tablie lors de la traduction des termes anglais. Quand on parle de \u201cdisplay resolution\u201d outre-Manche, il s\u2019agit en fait du terme \u201cd\u00e9finition\u201d fran\u00e7ais. La r\u00e9solution prend quant \u00e0 elle le nom de \u201cpixel density\u201d.<\/p>\n\n\n\n<p>Il n\u2019est pas rare que les vendeurs de produits high tech s\u2019emm\u00ealent \u00e9galement les pinceaux entre ces 2 termes, ce qui n\u2019aide pas \u00e0 garder ces notions lipides aupr\u00e8s du grand public.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Notre astuce pour optimiser d\u00e9finition et r\u00e9solution<\/h2>\n\n\n\n<p>Pour garder la main sur vos cr\u00e9ations et \u00e9viter les mauvaises surprises, prenez le temps de cr\u00e9er le fichier image correspondant \u00e0 votre projet, <strong>avec la d\u00e9finition et la r\u00e9solution parfaites pour votre support<\/strong>.<\/p>\n\n\n\n<p>Pour optimiser votre temps et mener vos projets artistiques, vid\u00e9os ou photos, <strong><a href=\"https:\/\/graphiste.com\/#open-fast\">faire appel \u00e0 un graphiste<\/a><\/strong> vous permettra de disposer des fichiers au format voulu pour une exploitation optimale.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qu\u2019il s\u2019agisse de vid\u00e9os ou de photos, il n\u2019y a rien de plus frustrant que de d\u00e9couvrir le fruit de son travail pixelis\u00e9 ou illisible, quel que soit le support. Cela peut venir d\u2019une d\u00e9finition ou d\u2019une r\u00e9solution non appropri\u00e9e. Un graphiste freelance prendra en compte syst\u00e9matiquement les exigences de votre projet pour un rendu [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":51063,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[27],"tags":[],"class_list":["post-51062","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-webdesign"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quelle est la diff\u00e9rence entre la r\u00e9solution et la d\u00e9finition&nbsp;? - Graphiste Blog<\/title>\n<meta name=\"description\" content=\"Qu\u2019il s\u2019agisse de vid\u00e9os ou de photos, il n\u2019y a rien de plus frustrant que de d\u00e9couvrir le fruit de son travail pixelis\u00e9 ou illisible, quel que soit le\" \/>\n<meta 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