Degraded image quality


When a photo is send in EasySocial, I noticed that the quality of the picture is less good.
There is less sharpness, the colors are less brilliant, and especially the weight is superior to the original.
How to remedy this?

If the resolution of the original photo is 1280 pixels wide, there is no loss of sharpness in the final photo. But always a loss of color.
On the other hand, if the resolution of the original photo is 2000 pixels wide for example, there is a loss of sharpness and also color.

I specify that my original photos are in Adobe Rgb (color profile).
Why not use ImageMagick which is more powerful?
Because GD Library does not support color profiles...

Thank you

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