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JRVR > Calibration > 3DLUT Gamma (tone curve) - what is it?
mattkhan:
--- Quote from: Hendrik on May 31, 2023, 02:58:50 am ---Looking at the madVR 3DLUT file, the values seem to also match your madVR screenshot. For some reason the LUTs are just very different. I can try to add support for madVR 3DLUTs, but there was a reason I didn't do it in the past .. i forgot exactly what it was. Maybe I'll remember when I work on it. Them being limited range is a bit annoying, but maybe something I can work around.
--- End quote ---
certainly that would be great from the perspective of maintaining a known to work workflow, thanks for considering it, seems a shame if the native format doesn't work though. I wonder if it's a displaycal or argyllcms issue here? I'll dig around the code to see.
mattkhan:
checked the commands displaycal uses to generate the lut, it's all done by argyllcms (https://www.argyllcms.com/doc/collink.html) and the only different switches are the input/output encoding & the lut type. I'd hope it's just a Q of finding the right settings to use to make it compatible with jrvr.
Hendrik:
So I made madVR 3DLUTs work. And interesting result, both the cube and the madVR LUT produce basically the same adjustment for me, I certainly can't tell a visual difference. Both drastically raise the brightness of those 17-25 test bars.
mattkhan:
curious, perhaps I can try that build and see if I can reproduce? perhaps I can some difference in settings here then that is causing the difference?
the curve in these luts does have a lift at the low end btw so the impact on 17-25 is expected
Hendrik:
I sent you a test build.
Looking at your previous madVR shot, it looks as dark as no adjustment, if not darker. Makes me wonder if there is a difference in other gamma settings somewhere.
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