More > JRiver Media Center 31 for Windows
JRVR > Calibration > 3DLUT Gamma (tone curve) - what is it?
Hendrik:
I did some checking on how the 3DLUT is applied right now, and its always applied after literally everything else, right before output. Only dithering ever is done after. The only problem I can see with this position is that the new "apply gamut after 3dlut" option does not actually work, and I might have to remove it again. But otherwise I don't think we ever would want to apply the 3DLUT any earlier, because its mean to calibrate for the output, so doing it as close as possible to the output seems sensible to me.
mattkhan:
thanks for checking
a quick visual inspection (see attached, filenames indicate the gamma setting) shows that changing the jrvr option + the displaycal option in tandem does not produce the same output which, if I've understood the processing involved correctly, is an unexpected result
NB: this is just a screen cap, is there any shortcut built in so jrvr dumps guaranteed raw output to some lossless format?
mattkhan:
for comparison, previous madvr based setup is much darker
NB: no comment on accuracy of any individual option implied, just sharing this to indicate that this is obviously different to the naked eye
Hendrik:
Makes me wonder if thats a result of using a different color range, because in your madVR screenshot line 17 is cut off, as its literal black, that doesn't seem desirable either.
Applying the 3DLUT itself is not really magic. It indexes into the 3DLUT based on the colors (r,g,b forming the coordinates) and returns the result. Not sure what size madVR 3DLUTs usually are, but i think 65x65x65 is the biggest DisplayCal lets you make for .cube
mattkhan:
fwiw 17 is just about perceptible in a completely dark room
my setup is full range all the way, the cube lut is also 0-255 & 65^3, I believe madvr lut is also 65^3 (but 16-235 range)
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