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anon2

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  1. The app is producing the correct result. The opacity of overlapping semi-opaque regions is not, and should not be expected to be, added when you consider the mathematics of alpha compositing layerB on top of layerA: result = alphaB * colourB + (1 - alphaB) * colourA Consider where each of the masked pink layers have 50% opacity: Blending the lower pink layer with the opaque blue layer: result = 0.5 * [0.6666, 0.3251, 0.3251] + (1 - 0.5) * [0, 0, 1] = [0.3333, 0.1626, 0.6626] Blending the top pink layer with the first result: result = 0.5 * [0.6666, 0.3251, 0.3251] + (1 - 0.5) * [0.3333, 0.1626, 0.6626] = [0.5, 0.2439, 0.4939]
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