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Curves alpha channel issue

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I'm happy to see that the alpha channel control in the curves tool works better now. However, shouldn't it work whether or not it is located above the bitmap vs nested within the bitmap? It seems that when nested it has no influence on the graphic.




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Actually, it still doesn't work the way that I expected. I was under the impression that raising the low end of the alpha curve would allow any virtually invisible pixel would show up. Instead it just brightens the rgb values. Right?


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