The original image is uploaded as-is. ImageMagic is most likely used to create the thumbnail, but it shouldn't affect the rendering of the full-size image.
I've checked some of my own images just now, and they're exactly the same size and quality of the original.
Can you post a screenshot showing some examples? Or send them to me via email or something so I can follow it up if it genuinely appears to be a problem for some people.
Cheers
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