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Asked: 2026-05-13T10:07:23+00:00

How can I mix two ARGB pixels ? Example Here A is (Red with

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How can I mix two ARGB pixels ?

Example

Source: en.wikipedia.org/wiki/Alpha_compositing#mediaviewer/File:Alpha_compositing.svg

Here A is (Red with Alpha) and B is ( Blue with Alpha ).

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1 Answer

  1. Editorial Team

    Taken from the same Wikipedia article where you got the image:

    C_o = C_a \alpha_a + C_b \alpha_b \left(1 - \alpha_a\right)

    Translating to values which range from 0 to 255:

    rOut = (rA * aA / 255) + (rB * aB * (255 - aA) / (255*255))
gOut = (gA * aA / 255) + (gB * aB * (255 - aA) / (255*255))
bOut = (bA * aA / 255) + (bB * aB * (255 - aA) / (255*255))
aOut = aA + (aB * (255 - aA) / 255)
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