{"id":701,"date":"2021-03-21T23:14:15","date_gmt":"2021-03-21T22:14:15","guid":{"rendered":"https:\/\/jeromederieux.fr\/wordpress\/?p=701"},"modified":"2022-02-22T11:16:29","modified_gmt":"2022-02-22T10:16:29","slug":"images-et-resolution-la-theorie","status":"publish","type":"post","link":"https:\/\/jeromederieux.fr\/cmjn\/images-et-resolution-la-theorie\/","title":{"rendered":"Images et r\u00e9solution &#8211; La th\u00e9orie"},"content":{"rendered":"\n<p><strong>Souvent la r\u00e9solution d&rsquo;image pose pas mal de probl\u00e8mes \u00e0 ceux qui d\u00e9butent. En effet c&rsquo;est une notion qui, de prime abord, semble assez obscure, essayons de rendre cela plus clair.<\/strong><\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3oo-ppp\">3OO ppp ?<\/h2>\n\n\n\n<p>L&rsquo;imprimeur va vous demander afin d&rsquo;assurer la qualit\u00e9 d&rsquo;impression des images, que celles ci aient <strong>une r\u00e9solution de 300 dpi \/ ppp<\/strong>. M\u00eame sans trop comprendre ce que ceci signifie on imagine qu&rsquo;il existe une valeur propre aux images qu&rsquo;il faut r\u00e9gler \u00e0 cette valeur. Or ce n&rsquo;est pas le cas, nous allons voir comment ceci se passe r\u00e9ellement.<\/p>\n\n\n\n<p>Une image bitmap est compos\u00e9e de pixels. Ces pixels forment une mosa\u00efque g\u00e9om\u00e9trique rectangulaire ou carr\u00e9 qui permet de reproduire une image. On peut alors d\u00e9finir une<strong> taille d&rsquo;image<\/strong>, elle correspond au <strong>nombre de pixels<\/strong> dans la largeur par le nombre de pixels dans la hauteur. Ces valeurs vont \u00eatres primordiales pour nous.<\/p>\n\n\n\n<p>Pour bien comprendre les probl\u00e9matiques de r\u00e9solution, il faut garder \u00e0 l&rsquo;esprit que <strong>ce sont les pixels qui vont \u00eatre transform\u00e9s en points lors de l&rsquo;impression<\/strong>. Si votre image \u00e0 300 pixels de large vous aurez 300 points imprim\u00e9s, si elle a 2500 pixels vous aurez 2500 points imprim\u00e9s.<\/p>\n\n\n\n<p>Cependant, ce qui est indispensable de bien saisir, est que <strong>ces points vont couvrir un espace physique sur votre support imprim\u00e9 plus ou moins importants en fonction de la taille que vous choisissez pour monter votre image<\/strong>.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#fce903\"><strong>Le nombre de points divis\u00e9s par la taille d&rsquo;utilisation en pouce d\u00e9finit ce qu&rsquo;on appelle la r\u00e9solution de l&rsquo;image.<\/strong> L&rsquo;unit\u00e9 de r\u00e9solution est le point par pouce<strong> ppp<\/strong> ou, en anglais, dot per inch <strong>dpi<\/strong>.<\/p>\n\n\n\n<p>La taille en pouce est \u00e9gale \u00e0 la taille en centim\u00e8tre divis\u00e9e par 2,5 (Un pouce vaut 2,54 cm mais cette petite approximation facilite le calcul). <\/p>\n\n\n\n<p>Par exemple, si vous montez une image de<strong> 1200 pixels de large<\/strong> dans un cadre de 2 pouces de large (environ 5 cm), vous avez donc 1200\/2, c&rsquo;est \u00e0 dire 600 pixels par pouce pour l&rsquo;impression de votre image.<br>Si votre cadre fait 4 pouces (env. 10 cm), votre image a une r\u00e9solution de 1200\/4, 300 ppp.<br>Si votre cadre fait 8 pouces (env. 20 cm), votre image a alors une r\u00e9solution de 1200\/8, 150 ppp.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image1.jpg\" alt=\"\" class=\"wp-image-711\" width=\"407\" height=\"212\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image1.jpg 826w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image1-300x157.jpg 300w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image1-768x401.jpg 768w\" sizes=\"auto, (max-width: 407px) 100vw, 407px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image2.jpg\" alt=\"\" class=\"wp-image-712\" width=\"267\" height=\"345\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image2.jpg 343w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image2-232x300.jpg 232w\" sizes=\"auto, (max-width: 267px) 100vw, 267px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image3.jpg\" alt=\"\" class=\"wp-image-713\" width=\"433\" height=\"562\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image3.jpg 547w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image3-231x300.jpg 231w\" sizes=\"auto, (max-width: 433px) 100vw, 433px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image4-724x1024.jpg\" alt=\"\" class=\"wp-image-714\" width=\"567\" height=\"802\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image4-724x1024.jpg 724w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image4-212x300.jpg 212w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image4-768x1087.jpg 768w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image4.jpg 826w\" sizes=\"auto, (max-width: 567px) 100vw, 567px\" \/><\/figure><\/div>\n\n\n\n<p>La r\u00e9solution n&rsquo;est pas une valeur fixe sp\u00e9cifique \u00e0 l&rsquo;image, elle peut prendre des valeurs diff\u00e9rentes.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#fce903\"><strong>La r\u00e9solution de l&rsquo;image est d\u00e9termin\u00e9e par sa taille d&rsquo;utilisation.<\/strong><\/p>\n\n\n\n<p>Plus la taille d&rsquo;utilisation augmente, plus la r\u00e9solution baisse et inversement.<br>   <br>Lorsque vous utilisez un cadre qui ne reprends qu&rsquo;une partie de l&rsquo;image, ce n&rsquo;est pas la taille de ce cadre qui d\u00e9termine la r\u00e9solution mais bien celle de l&rsquo;image compl\u00e8te m\u00eame si elle n\u2019appara\u00eet pas enti\u00e8rement. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image5-830x1024.jpg\" alt=\"\" class=\"wp-image-724\" width=\"389\" height=\"480\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image5-830x1024.jpg 830w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image5-243x300.jpg 243w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image5-768x947.jpg 768w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image5.jpg 1104w\" sizes=\"auto, (max-width: 389px) 100vw, 389px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"bonne-resolution\">Bonne r\u00e9solution<\/h2>\n\n\n\n<p>L&rsquo;imprimeur demande que la r\u00e9solution de vos images soit de 300 ppp. C&rsquo;est la r\u00e9solution optimale qui garantie qu&rsquo;elles seront correctement imprim\u00e9es.<br>Si la r\u00e9solution est <strong>sup\u00e9rieure ou \u00e9gale \u00e0 300 ppp, il n&rsquo;y a pas de probl\u00e8me<\/strong>, le nombre de pixels est suffisant pour garantir la qualit\u00e9 d&rsquo;impression.<\/p>\n\n\n\n<p>Si la r\u00e9solution est <strong>inf\u00e9rieure \u00e0 300 ppp,  la qualit\u00e9 des images se d\u00e9grade<\/strong> \u00e0 mesure que la r\u00e9solution baisse. Elles  apparaissent pixelis\u00e9es et floues. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Comparaison-Pouce.jpg\" alt=\"\" class=\"wp-image-716\" width=\"241\" height=\"488\" srcset=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Comparaison-Pouce.jpg 228w, https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Comparaison-Pouce-148x300.jpg 148w\" sizes=\"auto, (max-width: 241px) 100vw, 241px\" \/><figcaption>D\u00e9tails (1 pouce x 1 pouce) d&rsquo;une image en 600 ppp, 300 ppp et 150 ppp<\/figcaption><\/figure><\/div>\n\n\n\n<p><br>Il existe une tol\u00e9rance et vous pouvez int\u00e9grer des images avec une r\u00e9solution entre 250 ppp et 300 ppp mais sachez qu&rsquo;en dessous, cela n&rsquo;est pas conseill\u00e9.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#fce903\">Il faut comprendre qu&rsquo;il n&rsquo;y a pas d&rsquo;image qui aurait, a priori, une bonne r\u00e9solution et d&rsquo;autres non,<strong> TOUTES les images peuvent avoir une r\u00e9solution de 300 ppp<\/strong> ou plus et donc \u00eatre imprim\u00e9es avec une qualit\u00e9 optimale, <strong>MAIS pas \u00e0 n&rsquo;importe quelle taille<\/strong>. <br><strong>Cette r\u00e9solution de 300 ppp impose une taille optimale d&rsquo;impression qu&rsquo;il ne faut pas d\u00e9passer<\/strong>.<br><br>Il en d\u00e9coule que,<strong> plus votre image a de pixels, plus vous avez de latitude concernant la taille d&rsquo;impression<\/strong>.<\/p>\n\n\n\n<p>Une image de 1200 x 1200 pixels aura une taille optimale de 10 x 10 cm, et il est d\u00e9conseill\u00e9 de l&rsquo;utiliser au del\u00e0 de ces valeurs.<br>Une image de 3600 x 3600 pixels aura une taille d&rsquo;impression optimale de 30 x 30 cm, elle pourra \u00eatre imprim\u00e9e sur un A4 sans probl\u00e8me (et bien entendu, dans tous les formats plus petits).<\/p>\n\n\n\n<p>Ainsi, vous ne pouvez pas utiliser n&rsquo;importe qu&rsquo;elle image \u00e0 n&rsquo;importe qu&rsquo;elle taille. <br>Par exemple, si vous avez une image de 1000 pixels de large, vous ne pourrez pas l&rsquo;utiliser pour une couverture A4. Il vous faudra r\u00e9duire la taille d&rsquo;utilisation ou obtenir une image avec d&rsquo;avantage de pixels.<br>Une troisi\u00e8me solution, mais qui n&rsquo;est pas forc\u00e9ment id\u00e9ale, est d&rsquo;augmenter artificiellement le nombre de pixels de l&rsquo;image (r\u00e9\u00e9chantillonnage) si celui ci reste mod\u00e9r\u00e9. Nous verrons cela dans un prochain article.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Nombre de pixels<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Taille optimale d&rsquo;impression \u00e0 300ppp<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">1200 x 1200 pixels<\/td><td class=\"has-text-align-center\" data-align=\"center\">10 x 10 cm<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">2400 x 2400 pixels<\/td><td class=\"has-text-align-center\" data-align=\"center\">20 x 20 cm<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">3600 x 3600 pixels<\/td><td class=\"has-text-align-center\" data-align=\"center\">30 x 30 cm<\/td><\/tr><\/tbody><\/table><figcaption>Exemple de la taille optimale d&rsquo;impression pour diff\u00e9rentes tailles d&rsquo;images<br>Il faut \u00e9viter  de d\u00e9passer la taille optimale sous peine de pixeliser l&rsquo;aspect de l&rsquo;image.<br><\/figcaption><\/figure>\n\n\n\n<p>Nous voyons qu&rsquo;il est primordial de conna\u00eetre, la taille optimale d&rsquo;utilisation qu&rsquo;offre chaque image et de pouvoir ensuite, lors de son utilisation, contr\u00f4ler sa r\u00e9solution. Les logiciels que nous utilisons vont nous permettre de conna\u00eetre ses informations et r\u00e9aliser ses op\u00e9rations facilement. C&rsquo;est l&rsquo;objet du prochain article. <a href=\"https:\/\/jeromederieux.fr\/cmjn\/images-et-resolution-la-pratique\/\" target=\"_blank\" rel=\"noreferrer noopener\">La r\u00e9solution d&rsquo;images dans la pratique.<\/a><\/p>\n\n\n\n<p><strong>Ce qu&rsquo;il faut retenir<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Une image est compos\u00e9e de pixels. Sa taille correspond au nombre de pixel de large par le nombre de pixel de haut.<\/li><li>Ce sont ces pixels qui sont transform\u00e9s en points lors de l&rsquo;impression.<\/li><li>Le nombre de points par pouce (2,54 cm) d\u00e9termine la r\u00e9solution de l&rsquo;image.<\/li><li>Changer la taille d&rsquo;impression de l&rsquo;image modifie la r\u00e9solution.<\/li><li>La r\u00e9solution recommand\u00e9e pour l&rsquo;impression est de 300 ppp. Si l&rsquo;image a une r\u00e9solution plus importante pas de probl\u00e8me.<br>Si l&rsquo;image a une r\u00e9solution inf\u00e9rieure a 300 ppp, il faut \u00e9viter de l&rsquo;utiliser dans cette taille. La solution est de la r\u00e9duire.<\/li><\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Souvent la r\u00e9solution d&rsquo;image pose pas mal de probl\u00e8mes \u00e0 ceux qui d\u00e9butent. En effet c&rsquo;est une notion qui, de prime abord, semble assez obscure, essayons de rendre cela plus clair.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,10],"tags":[],"class_list":["post-701","post","type-post","status-publish","format-standard","hentry","category-resolution","category-theorie"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Images et r\u00e9solution - La th\u00e9orie - cmjn<\/title>\n<meta name=\"description\" content=\"PAO libre\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jeromederieux.fr\/cmjn\/images-et-resolution-la-theorie\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Images et r\u00e9solution - La th\u00e9orie - cmjn\" \/>\n<meta property=\"og:description\" content=\"PAO libre\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jeromederieux.fr\/cmjn\/images-et-resolution-la-theorie\/\" \/>\n<meta property=\"og:site_name\" content=\"cmjn\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-21T22:14:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-02-22T10:16:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/jeromederieux.fr\/cmjn\/wp-content\/uploads\/2021\/03\/Image1.jpg\" \/>\n<meta name=\"author\" content=\"jerome\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"jerome\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/jeromederieux.fr\\\/cmjn\\\/images-et-resolution-la-theorie\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/jeromederieux.fr\\\/cmjn\\\/images-et-resolution-la-theorie\\\/\"},\"author\":{\"name\":\"jerome\",\"@id\":\"https:\\\/\\\/jeromederieux.fr\\\/cmjn\\\/#\\\/schema\\\/person\\\/44e133b5799f4cdbe8502c88afcb3227\"},\"headline\":\"Images et r\u00e9solution &#8211; 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