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Est-ce qu'on améliore la qualité d'une image en augmentant sa résolution dans Photoshop?
"Does it improve the quality of an image by increasing its resolution in Photoshop?"
NO, if you mean Resolution pixel per inch - that will only change instruction for printer, assuming that Resample is turned off.
If you mean to change image dimensions what is also commonly refered as resolution the answer is again NO, it will decrease image quality if you enlarge image.