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Confused about additive layers

May 31, 2014, 17:29 (This post was last modified: May 31, 2014 17:30 by braddabug.)
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Confused about additive layers
I'm not new to Gimp, but I still don't understand additive layers. They should be simple, but they're not working the way I expect.

Here's what I mean. If I create a new image, and create 3 white layers, set each to an opacity of 33%, make each of them additive, then add a normal black layer underneath it all, shouldn't the final image be white? Since that becomes 0.33 + 0.33 + 0.33 + 0 = 0.99? But instead the image is definitely gray.

Why isn't it white?
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