I did saturation adjustment in Color Finesse in Adobe Premiere and I wanted to reproduce the result in vapoursynth. So I did some tests comparing different hsl filters in the vapoursynth/avisynth/virtualdub pool to see how close they are. In my test I took a sample image and test it on all filters with 50% saturation.
In the results, the Tweak() in vs and avs, and the internal hsv filter and the 6-axis color correction filter in virtualdub are all identical. The only one that's visibly different is Color Mill.
When compares to the result of Color Finesse, the previous four looks very much the same in every color except red, as you can see in the samples:
color finesse
vapoursynth
color mill
Why are the difference only in red?