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I have managed to solve this problem, but had to make some changes. Second picture, which used to be white mask - have to be changed to be consisted of pixels that are in color that don't exist on source picture. So, I have change the mask picture - white pixels are changed to HotPink pixels...

Hi, I have a few transparent .png images with same size and want to add or subtract them one of other and then put the image to picturebox. First picture: Second picture which contains white pixels (or it could be black pixels) which should be erased from first picture: The result should...