Toot

Written by Jez 🍞🌹 on 2024-09-13 at 07:44

@pglpm

OK, so alpha blending is straight linear interpretation, so an alpha of 0.5 leads to an equal contribution of each input colour to the output colour. If you then add a third layer with alpha 0.5, you get 50% colour 3 and 50% previous blend. But that previous blend is 50% colour 1 and 50% colour 2, so the final colour after three layers will be 25% colour 1, 25% colour 2 and 50% colour 3. The top colour always contributes the most. 1/n

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