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I want to make it so that I can change an image so that it only uses the colors I have listed, and if it doesn't have it, it changes to the closest available color. Is that possible and if so how?

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I found out the answer was in using an indexed color mode :)

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Yeah, and you can convert back to RGB when you're done, if you'd like to keep editing with full colour and alpha abilities. – Marc Edwards Jul 18 '12 at 6:03

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