Some more observations:
Using a RGB source,
- Color Finesse 3 different as tweak (converted to RGB using 709) as you reported
- Colorista 3 gives same results as tweak
- Lumetri gives something completely different than those
- AE's internal Hue/Saturation filter or colorbalance HLS completely different but same as each other
It has something to do with brightness compensation calc because a 191 red bar becomes 41,41,41 with complete desaturation for colorista but 57,57,57 with color finesse, 95,95,95 with internal h/s filter or colorbalance hls
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