{"id":6189,"date":"2026-11-02T12:03:34","date_gmt":"2026-11-02T09:03:34","guid":{"rendered":"https:\/\/wpcalc.com\/fr\/outils-web\/calculateur-ppi-pixels-par-pouce\/"},"modified":"2026-11-02T12:03:34","modified_gmt":"2026-11-02T09:03:34","slug":"calculateur-ppi-pixels-par-pouce","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/fr\/outils-web\/calculateur-ppi-pixels-par-pouce\/","title":{"rendered":"Calculateur de PPI \u2013 pixels par pouce"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Calculez la densit\u00e9 de pixels d\u2019un \u00e9cran, la distance de visionnage et les dimensions d\u2019impression<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"6189\" data-favorite-title=\"PPI\" data-favorite-url=\"https:\/\/wpcalc.com\/fr\/outils-web\/calculateur-ppi-pixels-par-pouce\/\" data-favorite-excerpt=\"Ce calculateur d\u00e9termine la densit\u00e9 de pixels (PPI) d\u2019un \u00e9cran \u00e0 partir de sa r\u00e9solution et de sa diagonale. Il convertit aussi les dimensions en pixels en dimensions d\u2019impression, et inversement, pour toute valeur en DPI. Saisissez la largeur, la hauteur et la diagonale pour obtenir le PPI, le pas de pixel, les dimensions physiques et la distance de visionnage.\" aria-label=\"Ajouter aux favoris\" data-favorite-icon=\"icon icon-conversion\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/fr\/outils-web\/calculateur-ppi-pixels-par-pouce\/\" method=\"POST\" class=\"calculator\" id=\"calculator-6189\" data-post=\"6189\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Champs de saisie<\/legend><div class=\"field is-single\" id=\"input-1\"><label for=\"field-1\">Mode<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"mode\"><option value=\"screen\" selected>Densit\u00e9 de pixels de l\u2019\u00e9cran (PPI)<\/option><option value=\"print\">R\u00e9solution d\u2019impression (PPI \/ DPI)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field is-single\" id=\"input-2\"><label for=\"field-2\">D\u00e9finition pr\u00e9d\u00e9finie<\/label><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"dfinition_prdfinie\"><option value=\"custom\" selected>Personnalis\u00e9e \u2014 saisissez la largeur et la hauteur ci-dessous<\/option><option value=\"1280x720\">1 280 \u00d7 720 (HD 720p)<\/option><option value=\"1920x1080\">1 920 \u00d7 1 080 (Full HD 1080p)<\/option><option value=\"2560x1440\">2 560 \u00d7 1 440 (QHD 1440p)<\/option><option value=\"3840x2160\">3 840 \u00d7 2 160 (4K UHD)<\/option><option value=\"5120x2880\">5120 \u00d7 2880 (5K)<\/option><option value=\"1920x1200\">1 920 \u00d7 1 200 (ordinateur portable 16:10)<\/option><option value=\"2560x1600\">2 560 \u00d7 1 600 (ordinateur portable 13\u2033\u201316\u2033)<\/option><option value=\"3024x1964\">3 024 \u00d7 1 964 (MacBook Pro 14\u2033)<\/option><option value=\"3456x2234\">3 456 \u00d7 2 234 (MacBook Pro 16\u2033)<\/option><option value=\"1080x2400\">1 080 \u00d7 2 400 (t\u00e9l\u00e9phone Android)<\/option><option value=\"1179x2556\">1 179 \u00d7 2 556 (iPhone 15 Pro)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Largeur en pixels<\/label><div class=\"term\">w<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"largeur_en_pixels\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"1920\"\/><div class=\"unit\" id=\"calc-unit-3\">px<\/div><small id=\"calc-info-3\">Nombre de pixels sur la largeur de l\u2019\u00e9cran ou de l\u2019image.<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-4\">Hauteur en pixels<\/label><div class=\"term\">h<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"hauteur_en_pixels\" id=\"field-4\" aria-describedby=\"calc-unit-4 calc-info-4\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"1080\"\/><div class=\"unit\" id=\"calc-unit-4\">px<\/div><small id=\"calc-info-4\">Nombre de pixels sur la hauteur de l\u2019\u00e9cran ou de l\u2019image.<\/small><\/div><div class=\"field has-term\" id=\"input-5\"><label for=\"field-5\">Diagonale de l\u2019\u00e9cran<\/label><div class=\"term\">d<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"diagonale_de_lcran\" id=\"field-5\" aria-describedby=\"calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.1\" value=\"24\"\/><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"in\" selected>po<\/option><option value=\"cm\">cm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-5\">Diagonale annonc\u00e9e de l\u2019\u00e9cran, hors bordures.<\/small><\/div><div class=\"field\" id=\"input-6\" hidden><label for=\"field-7\">R\u00e9solution d\u2019impression<\/label><input type=\"text\" name=\"rsolution_dimpression\" id=\"field-7\" aria-describedby=\"calc-unit-7 calc-info-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" value=\"300\"\/><div class=\"unit\" id=\"calc-unit-7\">DPI<\/div><small id=\"calc-info-7\">Pour l\u2019impression uniquement\u202f: 300 DPI est la norme pour les tirages photo, 150 DPI convient aux brouillons et 600 DPI permet un rendu tr\u00e8s fin.<\/small><\/div><div class=\"field is-single\" id=\"input-7\" hidden><label for=\"field-8\">Sens de la conversion<\/label><div class=\"grid grid-cols-1\"><select id=\"field-8\" name=\"sens_de_la_conversion\"><option value=\"px_size\" selected>Pixels \u2192 dimensions d\u2019impression<\/option><option value=\"size_px\">Dimensions d\u2019impression \u2192 pixels n\u00e9cessaires<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field\" id=\"input-8\" hidden><label for=\"field-9\">Largeur d\u2019impression<\/label><div class=\"field-group\"><input type=\"text\" name=\"largeur_dimpression\" id=\"field-9\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.1\" value=\"8\"\/><div class=\"grid grid-cols-1\"><select id=\"field-10\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"in\" selected>po<\/option><option value=\"cm\">cm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field\" id=\"input-9\" hidden><label for=\"field-11\">Hauteur d\u2019impression<\/label><div class=\"field-group\"><input type=\"text\" name=\"hauteur_dimpression\" id=\"field-11\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.1\" value=\"10\"\/><div class=\"grid grid-cols-1\"><select id=\"field-12\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"in\" selected>po<\/option><option value=\"cm\">cm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalculer\" id=\"calculate-button\" data-post=\"6189\">Calculer<\/button><button type=\"reset\">R\u00e9initialiser<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculer automatiquement<\/label><small>Si activ\u00e9, le r\u00e9sultat se met \u00e0 jour automatiquement d\u00e8s que vous modifiez une valeur.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> R\u00e9sultats<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Densit\u00e9 de pixels<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"PPI\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Pas de pixel<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>Largeur de l\u2019\u00e9cran<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-4\"><span class=\"field-title\"><span>Hauteur de l\u2019\u00e9cran<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-5\"><span class=\"field-title\"><span>Rapport largeur\/hauteur<\/span><\/span><span class=\"field-value\" id=\"result-5\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-6\"><span class=\"field-title\"><span>Nombre total de pixels<\/span><\/span><span class=\"field-value\" id=\"result-6\" data-unit=\"MP\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-7\"><span class=\"field-title\"><span>Distance de visionnage (vision 20\/20)<\/span><\/span><span class=\"field-value\" id=\"result-7\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-8\"><span class=\"field-title\"><span>Dimensions d\u2019impression<\/span><\/span><span class=\"field-value\" id=\"result-8\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-9\"><span class=\"field-title\"><span>D\u00e9finition requise<\/span><\/span><span class=\"field-value\" id=\"result-9\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-10\"><span class=\"field-title\"><span>D\u00e9tail du calcul<\/span><\/span><span class=\"field-value\" id=\"result-10\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copier le lien vers ce calcul<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Laisser un commentaire<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"6189\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">Que pensez-vous de ce r\u00e9sultat\u00a0?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">J\u2019aime <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Utile <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confus <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">D\u00e9\u00e7u <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inexact <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Formule de calcul du PPI<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formule<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ PPI = \\frac{\\sqrt{w^2 + h^2}}{d} \\]\n\\[ \\text{pas de pixel (mm)} = \\frac{25.4}{PPI} \\]\n\\[ \\text{distance de visionnage (in)} = \\frac{3438}{PPI} \\]\n\\[ \\text{dimension d\u2019impression (in)} = \\frac{\\text{pixels}}{DPI} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Avec :<\/strong><\/p>\n<ul>\n<li>\\(w\\) \u2014 largeur de la r\u00e9solution en pixels<\/li>\n<li>\\(h\\) \u2014 hauteur de la r\u00e9solution en pixels<\/li>\n<li>\\(d\\) \u2014 diagonale physique de l\u2019\u00e9cran en pouces<\/li>\n<\/ul>\n<p>La premi\u00e8re formule divise la diagonale exprim\u00e9e en pixels par la diagonale exprim\u00e9e en pouces : le r\u00e9sultat est le nombre de pixels par pouce. Les autres formules donnent la taille d\u2019un pixel en millim\u00e8tres, la distance \u00e0 partir de laquelle une personne ayant une acuit\u00e9 visuelle de 20\/20 ne distingue plus les pixels et les dimensions d\u2019impression d\u2019une image num\u00e9rique pour une valeur donn\u00e9e en DPI.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Exemple de calcul du PPI<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemple :<\/strong> un \u00e9cran de 24 pouces d\u2019une r\u00e9solution Full HD de 1920 \u00d7 1080 pixels (les valeurs par d\u00e9faut du calculateur).<\/p>\n<p>\\[ \\sqrt{1920^2 + 1080^2} = \\sqrt{4{,}852{,}800} \\approx 2202.91 \\text{ px} \\]<\/p>\n<p>\\[ PPI = \\frac{2202.91}{24} \\approx 91.79 \\]<\/p>\n<p><strong>R\u00e9sultat :<\/strong> environ <strong>91,79 PPI<\/strong>. Le pas de pixel est de 25,4 \u00f7 91,79 \u2248 0,2767 mm. L\u2019\u00e9cran mesure approximativement 20,92 \u00d7 11,77 in (53,1 \u00d7 29,9 cm), sa r\u00e9solution totale est de 2,07 m\u00e9gapixels et les pixels deviennent indiscernables \u00e0 partir d\u2019environ 37,5 in (95 cm).<\/p>\n<p>\n\r\n<\/section>\n<h2>Comment utiliser le calculateur<\/h2>\n<ol>\n<li>Ouvrez le menu <strong>Mode<\/strong>, puis choisissez <em>Densit\u00e9 de pixels de l\u2019\u00e9cran (PPI)<\/em> ou <em>R\u00e9solution d\u2019impression (PPI \/ DPI)<\/em>.<\/li>\n<li>En mode \u00e9cran, choisissez une <strong>R\u00e9solution pr\u00e9d\u00e9finie<\/strong> (par exemple, 1920 \u00d7 1080) ou s\u00e9lectionnez <em>Personnalis\u00e9e<\/em> pour saisir la <strong>Largeur de la r\u00e9solution<\/strong> et la <strong>Hauteur de la r\u00e9solution<\/strong> en pixels.<\/li>\n<li>Saisissez la <strong>Taille de la diagonale<\/strong> de l\u2019\u00e9cran et r\u00e9glez l\u2019<strong>Unit\u00e9<\/strong> sur pouces ou centim\u00e8tres. Utilisez la diagonale annonc\u00e9e, sans compter le cadre.<\/li>\n<li>Consultez les r\u00e9sultats : densit\u00e9 de pixels, pas de pixel, largeur et hauteur physiques de l\u2019\u00e9cran, rapport largeur\/hauteur, nombre total de m\u00e9gapixels et distance de visionnage pour une acuit\u00e9 visuelle de 20\/20. La rubrique <em>D\u00e9tails du calcul<\/em> pr\u00e9sente chaque \u00e9tape.<\/li>\n<li>En mode impression, indiquez la <strong>R\u00e9solution d\u2019impression<\/strong> en DPI et le <strong>Sens de conversion<\/strong> : <em>Pixels \u2192 dimensions d\u2019impression<\/em> utilise les m\u00eames champs de r\u00e9solution, tandis que <em>Dimensions d\u2019impression \u2192 pixels n\u00e9cessaires<\/em> vous demande la <strong>Largeur d\u2019impression<\/strong> et la <strong>Hauteur d\u2019impression<\/strong> en pouces ou en centim\u00e8tres.<\/li>\n<\/ol>\n<h2>Qu\u2019est-ce que le PPI et \u00e0 quoi sert-il ?<\/h2>\n<p>Le nombre de pixels par pouce (PPI) mesure la densit\u00e9 de pixels d\u2019un \u00e9cran : il indique combien de pixels tiennent sur un pouce de longueur. Plus cette densit\u00e9 est \u00e9lev\u00e9e, plus les d\u00e9tails sont fins, les contours lisses et le texte net. Deux \u00e9crans peuvent avoir la m\u00eame r\u00e9solution de 1920 \u00d7 1080 et produire pourtant des images tr\u00e8s diff\u00e9rentes : sur un mod\u00e8le de 24 pouces, ces pixels sont r\u00e9partis \u00e0 environ 92 PPI, contre plus de 360 PPI sur un t\u00e9l\u00e9phone de 6 pouces. C\u2019est ce qui rend les petits \u00e9crans si nets.<\/p>\n<p>La formule repose sur un constat : les deux dimensions d\u2019une r\u00e9solution comme 1920 \u00d7 1080 forment les c\u00f4t\u00e9s d\u2019un triangle rectangle. D\u2019apr\u00e8s le th\u00e9or\u00e8me de Pythagore, la diagonale compte \\(\\sqrt{1920^2 + 1080^2} \\approx 2202.91\\) pixels. Il suffit donc de diviser ce nombre par la diagonale physique en pouces pour obtenir la densit\u00e9. Ce calcul suppose des pixels carr\u00e9s et r\u00e9guli\u00e8rement espac\u00e9s, comme sur la quasi-totalit\u00e9 des dalles LCD et OLED actuelles.<\/p>\n<p>Pour interpr\u00e9ter le r\u00e9sultat, il faut tenir compte de la distance de visionnage. La <em>distance de visionnage<\/em> indiqu\u00e9e parmi les r\u00e9sultats correspond \u00e0 la distance \u00e0 laquelle un pixel occupe un angle d\u2019une minute d\u2019arc, soit la limite de r\u00e9solution d\u2019une vision 20\/20. \u00c0 cette distance ou au-del\u00e0, les pixels se confondent et l\u2019image para\u00eet parfaitement lisse. Voil\u00e0 pourquoi un t\u00e9l\u00e9viseur 4K de 55 pouces \u00e0 80 PPI offre une belle image depuis un canap\u00e9, alors qu\u2019un t\u00e9l\u00e9phone tenu \u00e0 30 cm des yeux a besoin d\u2019au moins 400 PPI.<\/p>\n<p>Le PPI est une caract\u00e9ristique mat\u00e9rielle de l\u2019\u00e9cran ; le DPI (points par pouce) concerne les imprimantes et les scanners. Dans le domaine de l\u2019impression, les deux termes sont souvent employ\u00e9s l\u2019un pour l\u2019autre, m\u00eame si une imprimante \u00e0 jet d\u2019encre d\u00e9pose g\u00e9n\u00e9ralement plusieurs points pour reproduire un seul pixel de l\u2019image. Le mode impression de ce calculateur convertit les dimensions en pixels d\u2019une image en dimensions d\u2019impression, ou indique le nombre de pixels n\u00e9cessaires pour un format donn\u00e9. Par exemple, une photo de 8 \u00d7 10 in \u00e0 300 DPI n\u00e9cessite 2400 \u00d7 3000 pixels, soit environ 7,2 m\u00e9gapixels.<\/p>\n<h2>Hypoth\u00e8ses, limites et conseils<\/h2>\n<ul>\n<li><strong>Le calcul suppose des pixels carr\u00e9s.<\/strong> Les \u00e9crans \u00e0 tube cathodique et quelques \u00e9crans particuliers utilisaient des pixels non carr\u00e9s ; le r\u00e9sultat serait trompeur pour ces appareils.<\/li>\n<li><strong>Utilisez la diagonale r\u00e9elle, sans compter le cadre.<\/strong> Ne mesurez que la surface d\u2019affichage active, faute de quoi le PPI calcul\u00e9 sera trop faible.<\/li>\n<li><strong>Le PPI ne suffit pas \u00e0 d\u00e9terminer la nettet\u00e9 per\u00e7ue.<\/strong> \u00c0 densit\u00e9 de pixels \u00e9gale, les pixels paraissent plus petits quand on s\u2019\u00e9loigne : examinez toujours le PPI avec la distance de visionnage.<\/li>\n<li><strong>Pour l\u2019impression, 300 DPI est une valeur de r\u00e9f\u00e9rence fiable<\/strong> pour obtenir une qualit\u00e9 photo \u00e0 distance de lecture ; 150 DPI suffisent g\u00e9n\u00e9ralement pour des affiches vues \u00e0 un m\u00e8tre ou plus, et 600 DPI conviennent aux reproductions d\u2019\u0153uvres d\u2019art tr\u00e8s d\u00e9taill\u00e9es.<\/li>\n<li><strong>La mise \u00e0 l\u2019\u00e9chelle compte en pratique.<\/strong> Sur les \u00e9crans \u00e0 PPI \u00e9lev\u00e9, l\u2019interface est g\u00e9n\u00e9ralement affich\u00e9e \u00e0 150\u2013200 %, ce qui joue sur la lisibilit\u00e9 de ses \u00e9l\u00e9ments, mais ne change pas la densit\u00e9 r\u00e9elle de l\u2019\u00e9cran.<\/li>\n<li><strong>Agrandir une image n\u2019ajoute pas de d\u00e9tails.<\/strong> Augmenter artificiellement ses dimensions pour atteindre une valeur cible en DPI accro\u00eet le nombre de pixels, pas le niveau de d\u00e9tail r\u00e9el. Pour pr\u00e9parer une impression de qualit\u00e9, vous pouvez aussi v\u00e9rifier les couleurs avec le <a href=\"https:\/\/wpcalc.com\/fr\/outils-web\/convertisseur-couleurs\/\">Convertisseur de couleurs<\/a> ou examiner les donn\u00e9es de l\u2019image avec le <a href=\"https:\/\/wpcalc.com\/fr\/outils-web\/convertisseur-hexadecimal\/\">Convertisseur hexad\u00e9cimal<\/a>.<\/li>\n<\/ul>\n<h2>Densit\u00e9s de pixels courantes<\/h2>\n<table>\n<thead>\n<tr>\n<th>Appareil<\/th>\n<th>R\u00e9solution<\/th>\n<th>Diagonale<\/th>\n<th>PPI approx.<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00c9cran Full HD de 24\u2033<\/td>\n<td>1920 \u00d7 1080<\/td>\n<td>24 in<\/td>\n<td>92<\/td>\n<\/tr>\n<tr>\n<td>\u00c9cran 4K de 27\u2033<\/td>\n<td>3840 \u00d7 2160<\/td>\n<td>27 in<\/td>\n<td>163<\/td>\n<\/tr>\n<tr>\n<td>Ordinateur portable QHD+ de 13\u2033<\/td>\n<td>2560 \u00d7 1600<\/td>\n<td>13,3 in<\/td>\n<td>227<\/td>\n<\/tr>\n<tr>\n<td>T\u00e9l\u00e9viseur 4K de 55\u2033<\/td>\n<td>3840 \u00d7 2160<\/td>\n<td>55 in<\/td>\n<td>80<\/td>\n<\/tr>\n<tr>\n<td>Smartphone r\u00e9cent<\/td>\n<td>1080 \u00d7 2400<\/td>\n<td>6,5 in<\/td>\n<td>400<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Les densit\u00e9s sup\u00e9rieures \u00e0 environ 300 PPI sont souvent pr\u00e9sent\u00e9es comme \u00e9tant de qualit\u00e9 \u00ab Retina \u00bb : au-del\u00e0 de ce seuil, les pixels sont invisibles \u00e0 une distance de visionnage normale. Des densit\u00e9s encore plus \u00e9lev\u00e9es profitent surtout aux casques de r\u00e9alit\u00e9 virtuelle, dont les \u00e9crans sont regard\u00e9s \u00e0 travers des lentilles.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ce calculateur d\u00e9termine la densit\u00e9 de pixels (PPI) d\u2019un \u00e9cran \u00e0 partir de sa r\u00e9solution et de sa diagonale. Il convertit aussi les dimensions en pixels en dimensions d\u2019impression, et inversement, pour toute valeur en DPI. Saisissez la largeur, la hauteur et la diagonale pour obtenir le PPI, le pas de pixel, les dimensions physiques et la distance de visionnage.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[36],"tags":[37],"class_list":["post-6189","post","type-post","status-publish","format-standard","hentry","category-outils-web","tag-outils-de-conversion"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/6189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/comments?post=6189"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/6189\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/media?parent=6189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/categories?post=6189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/tags?post=6189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}