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I hadn't even noticed the STMedianFilter change in hue until Wilbert pointed it out previously.
But I'm going to be making a YV12 version soon (maybe today) anyway and there are a couple obvious things I can try as I do that purple problem.
First, I think I should just leave the chroma alone, no filtering.
Second, IIRC STMedianFilter also does a small amount of averaging, not just clipping. This could cause rounding errors, so I'll get rid of that too.
Hopefully an update soon.
- Tom
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