More > JRiver Media Center 31 for Windows
JRVR > Calibration > 3DLUT Gamma (tone curve) - what is it?
Hendrik:
In some old posts, madVR claims to feed SDR signals untouched to the 3DLUT (eg. no gamma conversion, only conversion to RGB), based on that JRVR should be set to Rec.1886 source gamma to mimick a similar result.
mattkhan:
does the same apply for tone mapped HDR? i.e. the input to the 3dlut is the output from tone mapping?
Hendrik:
At that point its already SDR, yes.
You can read the OSD for this as well, the steps in the detail list are actually in order. 3DLUT should be after tone mapping.
mattkhan:
ok so when using a 3DLUT, the relevant bits of the pipeline is
input -> JRVR transformation (colourspace/gamma) -> 3dlut
and the output of that 2nd step comes from the "3D LUT Gamma (tone curve)" (and colourspace) setting, I then need to make sure that I generated the 3dlut in displaycal using the same values and it should "just work"
the only problem here is that I'm fairly sure this is what I was actually doing in the 1st place yet coming out of black was visibly off (too bright) & hence this thread exists
I'll post back after I remeasure to be sure
Hendrik:
And if you want to get as close to madVR behavior as possible, as I understand it anyway, set the 3DLUT Gamma in JRVR to Rec. 1886, as that will result in no change to gamma from the original video - at least for SDR. For HDR obviously it has to convert from PQ to Gamma.
Oh and one final thing to note, madVR 3DLUTs are limited range (tv range). .cube LUTs should be full range.
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