GradFun3(): Fix error when thr and thrc are different

WolframRhodium / muvsfunc

Muonium's VapourSynth functions

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GradFun3(): Fix error when thr and thrc are different #25

Closed LittlePox closed 5 years ago

LittlePox commented 5 years ago

When Y and UV need to be processed separately, the planes parameter wasn't set correctly. This commit fix the issue and add some description about the chroma_flag variable.