MJW Posted June 20, 2021 Share Posted June 20, 2021 I don't know if this is a bug or not, but the way alpha is used in the Additive blending mode seems odd to me. If I have an opaque lower layer and an upper layer with partially-transparent pixels and the Additive blending mode, I would expect (or at least hope) the blending equation would be something like: Cimage = Clower + (Aupper * Cupper) / 255 Where C is a color component (R, G, or B ) and A is alpha. For many color combinations it is, but in other cases it's quite different. For instance if the lower layer color is (20, 20, 20) and the upper layer color is (255, 255, 255) with an alpha of 85, the image color is (98, 98, 98) whereas the above equation gives (105, 105, 105). If the Additive blending mode is working as intended, I would very much appreciate knowing the actual blending equation it uses. (I hate that smiley-face-with-sunglasses that happens automatically on the forum when a right paren follows a B. Useless and annoying!) 1 Quote Link to comment Share on other sites More sharing options...
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