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Techniques de base pour de meilleures images
Une image numérique est constituée par une multitude de petits points appelés pixels.
Plus l’image comporte de pixels, plus sa taille est importante, plus elle occupe de mémoire et
plus elle est détaillée. La « taille d’image » s’exprime en nombre de pixels. Ces différences ne
sont pas visibles sur l’écran de l’appareil, mais la finesse des détails et la durée de traitement
des données ne sont pas les mêmes lors de l’impression ou de l’affichage sur un écran
d’ordinateur.
Description des pixels et de la taille d’image
Sélection de la taille d’image à utiliser (page 12)
Qualité A propos de la « qualité d’image » et de la « taille d’image »
1Taille d’image : 8M
3264 pixels × 2448 pixels = 7 990 272 pixels
2Taille d’image : VGA
640 pixels × 480 pixels = 307 200 pixels
Nombreux pixels
(Qualité d’image fine
et grande taille de
fichier)
Exemple : impression
jusqu’au format A3
Peu de pixels
(Qualité d’image
grossière, mais petite
taille de fichier)
Exemple : image à
joindre à un e-mail
Pixels
Pixel
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