Thanks for sharing my Painter LUT. I check the latest tab quite a bit, can’t believe I missed this.
I was originally making it to resemble UE4, since that’s where I have experience, but I realized how many VFX artists asked for OCIO support/ACES specifically which is why the download includes one version with changes eyeballed based on a color chart for UE4 and one version straight from Nuke.
However, as pointed out, the LUT still leaves a bit to be desired especially in the highlights. I felt like the whites were clipped pretty quickly, but wasn’t sure if it was the LUT or something with Painter.
I’d like to improve both LUTs if you guys have any other input. I see Thomas shared the gain value that separates UE4’s implementation from the reference, which I was fairly close just from eyeballing it at 1.65, but I reduced the gamma a bit as well. I’ll try it out with just the gain, but UE4 also has the “electric blue” correction after the transforms and a fake wide-gamut that shifts the colors a bit. I don’t know how much I’ll be able to replicate in Nuke.
This is my pipeline, perhaps I missed something since I’m new to Nuke and color transforms…
- Change Color Management to OCIO with ACES_1.0.3 and a working space of ACEScg
- Import Linear to Linear.exe, set Read to Utility - Linear - sRGB(Linear Gamma, sRGB primaries? But it uses Rec709 primaries, why are they both available?)
- Add OCIODisplay node, input ACEScg, display ACES, view transform to sRGB
- Write out Utility - Raw
I guess based on this thread, which I need to go back through, I’m getting the ODT but on an image outside of 0-1?