> I probably never would have noticed anything odd about Addition blend
> mode, except I was working with a channel layer stack from a color image
> where I already knew what the result of adding the layers *should* look
> like. But the highlights were subtly wrong, which is why I asked on the
> list whether maybe Addition blend mode was supposed to do something
> different from what I thought it did. And I'm glad I asked - your
> mathematical explanation of how layer opacities work is excellent, very
> clear. That information should go in the GIMP documentation somewhere,
> if it isn't already there.
Yeah, I probably would never have encountered this "in the wild" either because
layer opacity isn't something I use very often, and the clamping action is moot
at 100% opacity.
Numbers may not lie, but neither do they tell the whole truth.
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