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Ah, see, mergechroma(p) is a better idea! I was just using u=2,v=2... on the two mt_lutxys. Obviously that's going to copy chroma of clip #3 instead! (u/v=4 vs "copy first" works perfectly.) Clamp doesn't accept "copy third" however.
I'll give prewitt a try, I'm developing something with sobel but I'd definitely like more fine details. (Another I'm developing just needs rough edges since it'll be blurred anyway.)
If you work on resizing down the line, would it be better just to start with the current avisynth code and optimize that to include in the next version? Or would it be more sensible to just make your own FastResize filter?
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