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Just applying the algorithm to each color channel separately leads to color fringing when they get out of sync.

Is this effect bad enough that it's still visible in other color spaces that use a luminance channel?

I was working in YCbCr and I found it noticable. Compare the bottom-right tile in https://github.com/victorvde/jpeg2png/commit/64bf10789092ccf... with swipe. It's worst with green around the top of the left black line, but there's green and red fringing everywhere. And this is a normal use case.

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