A big caveat here: I’m not sure if this is the best or the correct way of plotting this. Is any of this relevant? Color scientists can answer that. Also forgive me for butchering any color science terminology in the text below. The nuke script is attached for those that want to play.
So this shows JzAzBz hue correlate (green line) of the scene linear values and ZCAM hue correlate (blue line) of display linear values after the DRTs. The x-axis is the entire luminance range of 14 stops compressed at the display side of course to 0-1 range. The y-axis is hue angle from 0 to 360, which I’m changing 5 degrees every frame. sRGB output transform.
DRT ZCAM v07: With ZCAM we can see what I pointed out earlier with the 3D plots is that the colors never hit the display white unlike with the other two DRTs. This seems to make the line follow much closer to the scene side hue line. If I plot this without doing gamut compression/mapping in the DRT the hue would not be as close, as @alexfry already demoed early on: ZCAM for Nuke - #9 by alexfry, there would be hue skews.
OpenDRT v0.0.90b4: With OpenDRT the biggest differences come from the clamping of the chroma “balloon” over the cube. Some of the hue differences come from the perceptual dechroma while with some other hues the perceptual dechroma helps to reduce the skews.
ACES 1.2: Just threw this for visual comparison.
Here’s the nuke script: plot_correlates.nk (589.5 KB)