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JRVR > Calibration > 3DLUT Gamma (tone curve) - what is it?

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mattkhan:
just to note that, as previously posted, the lack of pattern generator support makes this is quite a time consuming process, even 10 point gamma is slightly painful (takes at least 4x as long as automated pattern generator approach). I don't think I could face doing any significant colour checking manually.

Hendrik:

--- Quote from: mattkhan on May 29, 2023, 09:40:25 am ---as far as I can see, displaycal has no explicit option for this

--- End quote ---

There should be an option on the 3DLUT creation page ("tone curve"). for madVR its typically set to rec.1886 by default. I'm not sure if you can set this setting after measurement, there is some wording on there about it being a fixed part of the data.
Note that rec.1886 is typically used as the "source gamma" for video, unless it indicates otherwise, so it would basically mean a no-op on gamma processing before the 3DLUT, all other settings would perform gamma processing in such a case.

mattkhan:

--- Quote from: Hendrik on May 29, 2023, 10:52:41 am ---There should be an option on the 3DLUT creation page ("tone curve"). for madVR its typically set to rec.1886 by default. I'm not sure if you can set this setting after measurement, there is some wording on there about it being a fixed part of the data.
Note that rec.1886 is typically used as the "source gamma" for video, unless it indicates otherwise, so it would basically mean a no-op on gamma processing before the 3DLUT, all other settings would perform gamma processing in such a case.

--- End quote ---
the settings page looks like the attached, docs are https://displaycal.net/#create-3dlut which become these options to collink -> http://www.argyllcms.com/doc/collink.html#Ib

I was under the impression "tone curve" here is the target (output) response but I do find the terminology used in displaycal quite obscure so it's quite possible I'm wrong about that. Ultimately I had functioning (as in accurate) 3dlut before when driving it into madvr and I get apparently inaccurate now so need to work out where the delta is in order to move forward with jrvr. No doubt the right incantation will be found in the end :)

mattkhan:
https://www.avsforum.com/threads/madvr-argyllcms.1471169/post-48060585 says I'm wrong & it's the source
https://www.avsforum.com/threads/madvr-argyllcms.1471169/post-55191002 is one I now remember reading before and also goes into this

I'll regenerate my LUTs, remeasure and see what comes out the other end

mattkhan:
on the HDR side of things, the input is the output of the tone mapping or the actual source content?

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