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Petopeto? Personally I don't see anything wrong with those white lines. On average i would say most users would have some kind of graphic software and removing those would be a sinch, but if you're looking for perfection, then it would be ok.

If they don't the image wouldn't be editable for them anyway.

But like you said, just crop it larger than the image and sitck it above a pure black background and you'll see the white spots, and vice verse for dark spots.