Transparency: additive color blending

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Pierre 2013-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/80380-transparency-additive-color-blending

Hi,

Matlab seems to use the classical way to handle alpha channels, so that transparency works in a way 'subtractively', like layers of translucent fabric. If you pile up patches set with FaceAlpha = 0.5, say, you'll eventually end up with a dark zone.

I'd like to generate an additive mix, corresponding to the superposition of several light sources. Piling up enough of these patches would eventually lead to a white zone. If you code in OpenGL you can play with different modes of alpha blending, but I haven't found a similar way to do it in Matlab.

Thanks for any clue!

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Pierre 2013-6-27

I basically thought of adding alpha-premultiplied color channels (works only on a black background). Said otherwise: not multiplying the destination color by (1-alpha_src).

There may be smarter ways to do this. Please suggest them! Nevertheless 1) I'd like the color mix to be symmetrical; 2) it must be codable in Matlab!