Votre image est composée de millions de pixels, et chaque pixel a une valeur représentant sa couleur. La luminosité du pixel est dérivée de cette valeur. Un histogramme vous montre le nombre de pixels de chaque luminosité de votre image.

L’échelle en bas de l’histogramme va de gauche à droite, de 0% de luminosité (noir) à 100% de luminosité (blanc). Plus le pic est haut, plus il y a de pixels de cette luminosité dans l’image

Dans l’exemple d’histogramme ci-dessus, vous pouvez voir que la plupart des pixels ont une luminosité moyenne (le sommet de la montagne dans la région « Tons moyens »). Il y a beaucoup de pixels sombres (dans la région «Tons foncés ») et très peu de pixels clairs dans la région « Tons clairs ».

L’image ci-dessous a un histogramme montrant que la plupart des pixels sont de luminosité moyenne. Il y a deux pics dans l’histogramme – le pic le plus à gauche représentant les régions les plus sombres de l’image et le pic le plus à droite représentant les régions les plus claires.

La photo ci-dessous a un histogramme qui montre comment la plupart des pixels de l’image sont sombres ou noirs purs. Il y a un tout petit pic à l’extrême droite, qui se rapporte à la lumière des lampadaires.

2 réponses à “Les pixels de l’image”

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