This green bottle is an interesting example
The raw data sits well outside of both 709 and P3:
The image below shows:
- Left - ACES → 709 matrix | Exp -0.7 (to level match) | EOTF
- Middle - DRT_ZCAM_IzMh_v10_Blink
- Right - OpenDRT 0.0.90b4 (clamp disabled)
One thing I’d note here is that in both the simple Matrix and OpenDRT renderings, the hue of the liquid and the label on the front of the bottle both appear to be fairly similar. But if we look at the plot, they actually sit in pretty different positions.
Neither the simple Matrix+EOTF or OpenDRT really make an explict effort to compress down to the target display gamut, just clipping anything negative, which I assume is causing those two different greens to just collapse into eachother. Whilst DRT_ZCAM_IzMh is explictly trying to pull them back in along the M line to inside the display volume (although note, not completely inside with the current settings), but it is still maintaining speration between the liquid and the label, which are clearly different colours in reality.
As always, the question comes back to what did that liquid really look like to a human oberserver on the day?
I don’t think the issue here is what we see with blues going Cyan because of the way the ZCAM’s hue lines bend around towards cyan, as the ZCAM model’s hue lines around bottle’s run pretty straight when viewed like this:
