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How to fill the image color in a certain area?

I want to fill a color in the white area for a paint-based application, so please give me a suggestion on how to do this. enter image description here

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GPUImage is what you need, there are many filters. Basically, you need to tell ios that it needs to change all whitecolors RGB (255.0,255.0,255.0) to a different color.

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Source: https://habr.com/ru/post/1447669/

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