https://bugs.kde.org/show_bug.cgi?id=254784
--- Comment #5 from wolthera <griffinval...@gmail.com> ---
Ah, I just looked at this a little, and understand half of the problem now:

In Lab, the assumption is that when a and b are inactive, they aren't black,
but greyscale. (because they go from -0.5 to +0.5, so to speak.)

If you put a full mid-tone layer behind the image layer, and then disable the
channels, everything looks correct.

(Except for the part where the 'show single channels as color' doesn't seem to
make a difference...)

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