Thanks @sdyer for the notes and renaming of the thread.
Thanks @jmgilbert for your insight. I think your feedback on OpenDRT will be very valuable, since you are already using it in production. I’ll DM you about another chromaticity-preserving approach which may interest you.
On my side, I have been able to do a render that should illustrate the range of values that I was mentioning earlier. This test has been inspired by this thread on AC. I had been looking for a while to render something “iconic” for the VWG (hence my lego renders for instance). And by reading the notes on Gamut Compression, I thought : what is more iconic than a can of coke ?
So I did a bit of research to get the coca-cola red values, convert them to “linear-sRGB” and ended up with an exr texture of (0.9047, 0, 0). I then lit with an HDRI (the treasure island) and a distant light. Here are the results :
Linear - sRGB render, displayed in sRGB (ACES)
Same linear - sRGB render, displayed in sRGB (OpenDRT)
I was pretty pleased with this test because it matches exactly what I saw at the studio a couple of weeks ago, especially the red bounce on the white ball. To avoid any confusion, here are the exact steps of this test :
- A single render in the BT.709 footprint.
- Which was then taken to the wider gamut working space of ACEScg (in Nuke).
- Each was rendered from ACEScg through their respective transforms.
Regards,
Chris