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I view images on a black background (even in browser, I use a CSS override to change the post/show page to black), so when an image has a white line a few pixels thick on the edge, it sticks out.

("Users can do that themselves"--of course they can, they can also denoise and remove dust spots and relevel images themselves, but if you're cleaning up an image for upload, it's an easy thing to do while you're in there.)

(Of course, the image being cleaned up was uploaded initially by me, so this is a reminder to myself as much as a suggestion to others ...)