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Images with Alpha transparency in GD


b1011

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I have a "canvas" that is a solid white 110x110 rectangle (its a png file). I want to draw another PNG file on top of it using GD in php however it doesn't draw the alpha values correctly, and I need it to keep the alpha values (so some parts are transparent, etc) but it wont work. Is there anyway to acheive this? If so, could you point me in the right direction?

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