White halos usually stay hidden until a transparent PNG is placed on a darker surface. This guide explains why those outlines appear and how to catch the issue before it damages logos, product cards, portrait graphics, and website visuals.
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A PNG that looks clean on white can still fail badly on gray, black, or brand colors. Checking the cutout on several backgrounds is the fastest way to expose leftover edge contamination from the original image.
Common places where halos show up
Halos are especially visible around logo text, product corners, soft portrait edges, and hair details. They matter most when the final layout has stronger contrast than the original background did.
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Why does my transparent PNG still have white edges?
The edge pixels may still carry color information from the old background, especially if the original file was compressed or anti-aliased.