Blend color images 'image1' and 'image2' using an 8-bit alpha-blending mask channel. Equivalent to this operation on each pixel: imageOut = image1 * (1-(imageAlphaMask/255)) + image2 * (imageAlphaMask/255) So if a pixel in imageAlphMask is 0, then that pixel in imageOut will be image1, or if imageAlphaMask is 255 then imageOut is image2, or if imageAlphaMask was 200 then imageOut would be: image1
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