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How to calculate the destination area of an image.

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First of all, I thought this post should be posted here, because its more about algorithms and not so much about games. However my problem does contains spritesheets. I have some sprite sheets, and I wanted to make an algorithm that detect all images on the large sprite sheet, and while doing it saving the information to an array (the left side, top, width, height). After that I can use the array to generate animation files and other nice stuff. I don't like editing the sprites, but that is also besides the point. However I always end up with weird results, for example the left side is not the real xposition, but just his shoe's xposition for example. Currently I only tried doing it pixel by pixel ( until I saw a pixel that didn't was the "transparent" color. ), so no Neural Networks or anything like that, but it seems way harder. So perhaps there are people here with some more knowledge and experience who know some algorithm to do just that. language is not so important. I would like any comment.

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