{"id":7756,"date":"2024-01-29T15:18:47","date_gmt":"2024-01-29T14:18:47","guid":{"rendered":"https:\/\/chriswright.photography\/?p=7756"},"modified":"2024-02-02T18:06:57","modified_gmt":"2024-02-02T17:06:57","slug":"mastering-contrast-and-the-tone-curve","status":"publish","type":"post","link":"https:\/\/chriswright.photography\/fr\/mastering-contrast-and-the-tone-curve\/","title":{"rendered":"Ma\u00eetriser le contraste et la courbe des tons"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"dx-o-photo-lab-7\">DxO PhotoLab 7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les commandes de contraste et de courbe de tonalit\u00e9 dans DxO PhotoLab 7 sont subtilement diff\u00e9rentes de leurs \u00e9quivalents dans Adobe Lightroom.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table des mati\u00e8res<\/h2><nav><ul><li><a href=\"#dx-o-photo-lab-7\">DxO PhotoLab 7<\/a><\/li><li><a href=\"#video\">Vid\u00e9o<\/a><\/li><li><a href=\"#contrast-and-the-s-curve\">Contraste et courbe en S<\/a><\/li><li><a href=\"#contrast-and-the-tone-curve\">Contraste et courbe de tonalit\u00e9<\/a><\/li><li><a href=\"#rgb-curves\">Courbes RVB<\/a><\/li><li><a href=\"#a-workflow-for-tone\">Un flux de travail pour le ton<\/a><\/li><li><a href=\"#the-dx-o-photo-lab-7-video-series\">La s\u00e9rie de vid\u00e9os DxO PhotoLab 7<\/a><\/li><li><a href=\"#get-the-tools\">Obtenez les outils<\/a><\/li><li><a href=\"#subscribe\">S'abonner...<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"video\">Vid\u00e9o<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Ma\u00eetriser le contraste et la courbe des tons. DxO PhotoLab 7 Episode 4.1\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/m7H4YnNGdCM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\">Ma\u00eetriser le contraste et la courbe des tons<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019une des questions que les gens m\u2019ont pos\u00e9es est d\u2019expliquer la diff\u00e9rence entre le curseur de contraste et la courbe de tonalit\u00e9 et de donner quelques conseils sur le moment d\u2019utiliser l\u2019un, l\u2019autre ou les deux.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"contrast-and-the-s-curve\">Contraste et courbe en S<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9ponse courte est que l&#039;outil de contraste mod\u00e9lise une courbe en S et selon l&#039;endroit o\u00f9 vous placez le curseur, \u00e0 100, il cr\u00e9e des noirs profonds, du gris et des blancs \u00e9clatants, \u00e0 -100, il r\u00e9duit les noirs et les blancs en faveur du gris.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce curseur fonctionne sur un continuum entre le r\u00e9sultat \u00ab plat \u00bb \u00e0 -100 et le r\u00e9sultat \u00e0 contraste \u00e9lev\u00e9 \u00e0 +100. Il n\u2019y a rien de plus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les outils Microcontraste et Contraste fin peuvent \u00eatre ignor\u00e9s pour cet article, ils d\u00e9finissent des bords avec diff\u00e9rents degr\u00e9s de punch.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"contrast-and-the-tone-curve\">Contraste et courbe de tonalit\u00e9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La courbe de tonalit\u00e9 est un outil beaucoup plus complexe et c&#039;est pourquoi il faut plus de temps pour l&#039;apprendre. Vous pouvez reproduire l&#039;effet du curseur Contract en cr\u00e9ant une courbe en S peu profonde, vous pouvez prendre cette courbe et la rendre plus claire ou plus sombre en manipulant le param\u00e8tre Gamma tout en maintenant dans une certaine mesure le contraste entre les tons les plus sombres et les blancs les plus blancs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">De plus, vous pouvez cr\u00e9er plusieurs points sur la courbe pour modifier des plages de tons \u00e9troites dans l&#039;image. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce comportement peut \u00eatre d\u00e9montr\u00e9 graphiquement dans un d\u00e9grad\u00e9 tel que celui de l&#039;image du titre, mais peut para\u00eetre impr\u00e9visible dans la nature ! En fait, il est pr\u00e9visible, le secret est de savoir ce que fait l&#039;outil.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"610\" height=\"604\" src=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/The-Tone-Curve-DxO-PhotoLab-7.jpg\" alt=\"The Tone Curve - DxO PhotoLab 7\" class=\"wp-image-7762\" srcset=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/The-Tone-Curve-DxO-PhotoLab-7.jpg 610w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/The-Tone-Curve-DxO-PhotoLab-7-300x297.jpg 300w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/The-Tone-Curve-DxO-PhotoLab-7-150x150.jpg 150w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/The-Tone-Curve-DxO-PhotoLab-7-12x12.jpg 12w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">En prenant l&#039;image ici, le premier point en bas \u00e0 gauche de la courbe repr\u00e9sente le noir pur. Le point oppos\u00e9 en haut \u00e0 droite repr\u00e9sente le blanc pur. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les intersections en arri\u00e8re-plan, de gauche \u00e0 droite, repr\u00e9sentent les tons sombres, les tons moyens et les tons clairs. En pla\u00e7ant un point sur ou pr\u00e8s de la premi\u00e8re intersection et en le tirant verticalement vers le bas, je rends mes tons sombres plus sombres.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En pla\u00e7ant un point \u00e0 l&#039;intersection du c\u00f4t\u00e9 droit de la courbe et en le poussant verticalement vers le haut de l&#039;\u00e9chelle, je rends mes lumi\u00e8res plus claires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les tons moyens peuvent \u00eatre ajust\u00e9s en tirant le milieu de la courbe vers le haut ou vers le bas. Cela effectuera le r\u00e9glage en laissant les deux points d\u00e9j\u00e0 d\u00e9finis dans la m\u00eame position.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"455\" src=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-1024x455.jpg\" alt=\"Gamma Reduction in DxO PhotoLab 7\" class=\"wp-image-7764\" srcset=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-1024x455.jpg 1024w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-300x133.jpg 300w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-768x341.jpg 768w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-1536x683.jpg 1536w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-2048x910.jpg 2048w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Gamma-reduced-18x8.jpg 18w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">R\u00e9duction gamma<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Si je modifie la valeur gamma, visible sous le graphique \u00e0 partir de son param\u00e8tre par d\u00e9faut de 1, vous remarquerez que mon point m\u00e9dian reste sur la ligne verticale, tout comme les points sombres et clairs, mais ils bougent tous, cr\u00e9ant un rendu plus clair ou plus sombre de l&#039;image tout en conservant l&#039;obscurit\u00e9 et la luminosit\u00e9 relatives des points sombres et clairs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous n&#039;\u00eates pas oblig\u00e9 de vous limiter \u00e0 trois points, vous pouvez en avoir autant que vous le souhaitez, mais plus vous en avez, plus la gamme tonale sera \u00e9troite pour chaque point. Cela devient une d\u00e9cision subjective.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"rgb-curves\">Courbes RVB<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En plus de la courbe principale, il existe trois courbes de couleur : rouge, verte et bleue. La manipulation de ces courbes augmentera ou r\u00e9duira la valeur des pixels rouges, verts ou bleus dans la plage tonale dans laquelle vous placez le point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est important de se rappeler qu&#039;avec ces courbes, la r\u00e9duction de la valeur renforcera effectivement la couleur oppos\u00e9e sur la roue chromatique.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rouge\/Cyan<\/li>\n\n\n\n<li>Vert\/Magenta<\/li>\n\n\n\n<li>Bleu\/Jaune<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ces courbes peuvent \u00eatre combin\u00e9es pour produire n&#039;importe quelle couleur de votre choix, comme vous pouvez vous y attendre puisque nous traitons exclusivement des valeurs RVB en photographie num\u00e9rique.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"455\" src=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-1024x455.jpg\" alt=\"Colour Curves Combined DxO PhotoLab 7\" class=\"wp-image-7767\" srcset=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-1024x455.jpg 1024w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-300x133.jpg 300w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-768x341.jpg 768w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-1536x682.jpg 1536w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7-18x8.jpg 18w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Color-Curves-Combined-DxO-PhotoLab-7.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Courbes de couleurs combin\u00e9es<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dans cette image, j&#039;ai cr\u00e9\u00e9 une dominante orange dans les tons sombres en augmentant la courbe rouge et en r\u00e9duisant le bleu (en augmentant le jaune). Vous pouvez voir que l&#039;effet s&#039;estompe en fonction de la courbe \u00e0 mesure que nous \u00e9voluons vers les tons moyens et clairs.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"455\" src=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-1024x455.jpg\" alt=\"Restricting the Tonal Range Affected\" class=\"wp-image-7771\" srcset=\"https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-1024x455.jpg 1024w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-300x133.jpg 300w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-768x341.jpg 768w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-1536x682.jpg 1536w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1-18x8.jpg 18w, https:\/\/chriswright.photography\/wp-content\/uploads\/2024\/01\/Restricting-the-Tones-Affected-1.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Restreindre la gamme tonale<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Dans cette image, j&#039;ai cr\u00e9\u00e9 une fronti\u00e8re nette entre les zones sombres et les zones moyennes en manipulant les courbes rouges et bleues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"a-workflow-for-tone\">Un flux de travail pour le ton<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque vous modifiez un fichier RAW, vous pouvez utiliser le curseur de contraste pour effectuer ce que j&#039;appelle un r\u00e9glage \u00ab approximatif \u00bb. En supposant que vous souhaitiez plus de contraste, d\u00e9placez le curseur vers la droite jusqu&#039;\u00e0 ce que vous sentiez que le contraste est proche de ce que vous envisagez dans l&#039;image finale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ensuite, utilisez la courbe principale de l&#039;outil Courbe de tonalit\u00e9 pour affiner le contraste que vous avez cr\u00e9\u00e9 avec le curseur Contraste. \u00c0 mesure que vous vous familiariserez avec la Courbe de tonalit\u00e9, vous d\u00e9couvrirez peut-\u00eatre que c&#039;est le seul outil dont vous avez besoin, mais sa ma\u00eetrise n\u00e9cessite de l&#039;exp\u00e9rience.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Enfin, si vous avez besoin d\u2019ajuster la gamme tonale, vous pouvez utiliser les courbes de couleurs pour am\u00e9liorer les couleurs dans diff\u00e9rentes gammes de tons.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-dx-o-photo-lab-7-video-series\">La s\u00e9rie de vid\u00e9os DxO PhotoLab 7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Il existe une s\u00e9rie de vid\u00e9os, quatorze \u00e0 ce jour, couvrant divers aspects de PhotoLab 7, depuis une introduction \u00e0 l&#039;interface jusqu&#039;\u00e0 des sujets plus avanc\u00e9s comme <a href=\"https:\/\/chriswright.photography\/fr\/control-lines-and-grad-filters\/\" data-type=\"post\" data-id=\"7510\">DxO \u2013 Lignes de contr\u00f4le et filtres d\u00e9grad\u00e9s<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La s\u00e9rie compl\u00e8te est r\u00e9pertori\u00e9e ici, <a href=\"https:\/\/chriswright.photography\/fr\/dxo-photolab-7-videos\/\" data-type=\"post\" data-id=\"7466\">Vid\u00e9os sur DxO PhotoLab 7<\/a> et contient des liens vers chaque vid\u00e9o termin\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativement, le <a href=\"https:\/\/www.youtube.com\/playlist?list=PLEvtjZVTEv_PPVcqwD4178DI2HzGLy1X5\" data-type=\"link\" data-id=\"https:\/\/www.youtube.com\/playlist?list=PLEvtjZVTEv_PPVcqwD4178DI2HzGLy1X5\" target=\"_blank\" rel=\"noreferrer noopener\">Liste de lecture DxO<\/a> contenant ces vid\u00e9os peuvent \u00eatre trouv\u00e9es sur YouTube.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour ceux qui pr\u00e9f\u00e8rent le texte et les photos \u00e0 la vid\u00e9o, certaines s\u00e9ries sont disponibles sous forme d\u2019articles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chriswright.photography\/fr\/dxo-vs-adobe-repair-and-clone-tools\/\" data-type=\"post\" data-id=\"7706\">DxO vs Adobe Outils de r\u00e9paration et de clonage<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chriswright.photography\/fr\/creating-a-signature-in-photoshop\/\" data-type=\"post\" data-id=\"7775\">Cr\u00e9er une signature dans Photoshop<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/chriswright.photography\/fr\/control-lines-and-grad-filters\/\" data-type=\"post\" data-id=\"7510\">DxO \u2013 Lignes de contr\u00f4le et filtres d\u00e9grad\u00e9s<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"get-the-tools\">Obtenez les outils<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vous pouvez obtenir une version d&#039;essai de DxO PhotoLab <a class=\"thirstylink\" title=\"Essai DxO\" href=\"https:\/\/chriswright.photography\/fr\/recommends\/dxo-trial\/\" data-shortcode=\"true\">ici<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous pouvez acheter DxO PhotoLab 7 <a class=\"thirstylink\" title=\"Acheter DxO PhotoLab 7\" href=\"https:\/\/chriswright.photography\/fr\/recommends\/buy-dxo-photolab-7\/\" data-shortcode=\"true\">ici<\/a>.<\/p>\n\n\n<style>.kb-row-layout-id3919_a50959-24 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id3919_a50959-24 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id3919_a50959-24 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 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