Nico Weber 347e2831b2 LibGfx/WebPWriter: Do not write color index if only one channel varies ...

The benefit of the color indexing transform is to have only one
varying channel after it (the green channel, which after the
transform serves as index into the color table).

If there is only one varying channel before the transform, it's
not beneficial. (...except if there are <= 16 colors, then the
pixel bundling presumably still works.)

2024-06-01 14:52:00 +02:00

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