The Working Group would not be complete without squeezing-in some HSV based work.
So the transform used HSV and is thus Hue-Invariant, the RRT is used to compress the Value, Saturation is decreased reciprocally and Saturation is gamut mapped directly, so no OOG values.
Looking at Hues through the White to Black axis:
I have not implemented any controls because it is a quick toy to explore the usefulness of the HSV model for that particular exercise. It is rather elegant:
Now the good thing is that it is trivial to build a hue mask to protect and isolate some particular hues and help them reach full saturation faster.
TCL for Nuke here: HSV - Pseudo RRT · GitHub