{"id":2029,"date":"2020-06-24T09:52:20","date_gmt":"2020-06-24T07:52:20","guid":{"rendered":"http:\/\/cdscweb.fr\/chat-robaze\/?p=2029"},"modified":"2021-01-06T12:03:39","modified_gmt":"2021-01-06T11:03:39","slug":"photofiltre-ameliorer-une-image-luminosite-contraste","status":"publish","type":"post","link":"https:\/\/cdscweb.fr\/chat-robaze\/photofiltre-ameliorer-une-image-luminosite-contraste\/","title":{"rendered":"PhotoFiltre, am\u00e9liorer une image : luminosit\u00e9 et contraste"},"content":{"rendered":"<p style=\"text-align: center;\">PhotoFiltre propose des fonctions qui permettent de corriger certaines imperfections.<br \/>\nLa plupart de ces fonctions se trouvent dans le menu <strong>R\u00e9glage<\/strong><br \/>\nou sur la partie basse de la barre d&rsquo;outils reproduite ci-dessous.<br \/>\n<em>Elles s&rsquo;appliquent \u00e0 l&rsquo;image enti\u00e8re ou \u00e0 la partie de l&rsquo;image s\u00e9lectionn\u00e9e.<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3851\" src=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas.jpg\" alt=\"\" width=\"800\" height=\"63\" srcset=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas.jpg 1023w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-300x23.jpg 300w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-768x60.jpg 768w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-150x12.jpg 150w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Vous ne devez jamais travailler sur vos photos originales,<br \/>\ncar dans certains cas vous ne pourrez plus revenir en arri\u00e8re.<\/em><\/p>\n<h4 style=\"text-align: center;\"><b>Dupliquez toujours vos photos et travaillez sur les copies.<\/b><\/h4>\n<h5><strong>Les corrections automatiques<\/strong><\/h5>\n<p><strong>Correction automatique des Niveaux<\/strong> <em>(12 ou R\u00e9glage\/Niveaux automatiques)<\/em> :\u00a0pour une photo mal expos\u00e9e, cette fonction r\u00e9ajuste s\u00e9par\u00e9ment les couches rouges, vertes et bleues.<\/p>\n<p><strong>Correction automatique du Contraste<\/strong> <em>(13 ou R\u00e9glage\/Contraste automatique)<\/em> : pour une photo terne, l&rsquo;image s&rsquo;\u00e9claircit et retrouve des couleurs plus proches de la r\u00e9alit\u00e9.<\/p>\n<p style=\"text-align: center;\">Si les effets de correction semblent trop prononc\u00e9s, utilisez la fonction \u00c9dition\/Att\u00e9nuer.<\/p>\n<h5><strong>La luminosit\u00e9 et le contraste<\/strong><\/h5>\n<p><a href=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_luminosite.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-3857 size-medium\" src=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_luminosite-229x300.jpg\" alt=\"\" width=\"229\" height=\"300\" srcset=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_luminosite-229x300.jpg 229w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_luminosite-114x150.jpg 114w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_luminosite.jpg 397w\" sizes=\"auto, (max-width: 229px) 100vw, 229px\" \/><\/a>En g\u00e9n\u00e9ral, la luminosit\u00e9 et le contraste fonctionnent ensemble : si on augmente la luminosit\u00e9, l&rsquo;image sera un peu plus terne et il faudra augmenter le contraste.<\/p>\n<p><strong>Propri\u00e9t\u00e9s des fonctions Luminosit\u00e9 et Contraste<\/strong><\/p>\n<p>On les trouve dans le menu <em><strong>R\u00e9glage\/Luminosit\u00e9 <\/strong><\/em><\/p>\n<p>ou <em><strong>R\u00e9glage\/Contraste<\/strong><\/em>.<\/p>\n<p>Dans la fen\u00eatre qui s&rsquo;ouvre,<\/p>\n<p>\u00e0 l&rsquo;aide de la souris,<\/p>\n<p>d\u00e9placez la r\u00e9glette du haut pour modifier la luminosit\u00e9<\/p>\n<p><a href=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_contraste.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-3855 size-medium\" src=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_contraste-231x300.jpg\" alt=\"\" width=\"231\" height=\"300\" srcset=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_contraste-231x300.jpg 231w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_contraste-115x150.jpg 115w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/reglage_contraste.jpg 398w\" sizes=\"auto, (max-width: 231px) 100vw, 231px\" \/><\/a>ou pour modifier le contraste.<\/p>\n<p>Vous pouvez \u00e9galement modifier<\/p>\n<p>s\u00e9par\u00e9ment une couche couleur<\/p>\n<p>pour des ajustements plus fins.<\/p>\n<p>En augmentant le contraste,<\/p>\n<p>l&rsquo;image devient moins terne.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">Les boutons <em>(1)<\/em> et <em>(2)<\/em> font varier la <strong>luminosit\u00e9<\/strong> de -8% et +8%.<\/p>\n<p style=\"text-align: center;\">Les boutons <em>(3)<\/em>\u00a0 et <em>(4)<\/em> font varier le <strong>contraste<\/strong> de -10% et +10%.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3851\" src=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas.jpg\" alt=\"\" width=\"800\" height=\"63\" srcset=\"https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas.jpg 1023w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-300x23.jpg 300w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-768x60.jpg 768w, https:\/\/cdscweb.fr\/chat-robaze\/wp-content\/uploads\/barre-outils_bas-150x12.jpg 150w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p class=\"continue-reading-button\"> <a 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