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So I managed to scrounge together a set of Homestuck wallpapers in paint today and noticed that, when I set them as my background, there were some graphical errors/pixelation/something or other on some of them.
In the uploaded pic, the errors are around the red girl's horns, the orange male's right horn, and the hair by the red part of the glasses. How can I fix it? I can also upload them and have someone else do it for me, but I'd like to learn how to myself.