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JRVR tonemapping bright areas
murray:
--- Quote from: mattkhan on July 13, 2024, 06:24:36 am ---I would expect it to vary with configured peak nits, I run with 100 and the OP has 80. Perhaps 130 is sufficient to avoid the problem in this case.
--- End quote ---
Maybe I have no idea, its perfect on mine and the mountains are there right from the start just as there are also in my 1080 copy.
mattkhan:
--- Quote from: murray on July 13, 2024, 06:26:48 am ---Maybe I have no idea, its perfect on mine and the mountains are there right from the start just as there are also in my 1080 copy.
--- End quote ---
If you want to experiment, try reducing the peak nits and see if you start to see a similar effect
umberto5585:
Interesting.. I just did the experimenting you suggested. 130 nits does seem to avoid the white-out. It seems at 100nits is where the effect is more pronounced. Even 110 nits avoids the effect for the most part so maybe that's the sweet spot to avoid this with other movies although the added pop is preferred on a projector. I guess the main question is why is MadVR not having that same brightness adaptation struggle at the same target nits? I understand "accept as is" but thats not really a satisfying solution imo.
mattkhan:
Madvr doesn't have the same problem because it has a different set of algorithms. You can look through https://yabb.jriver.com/interact/index.php?topic=136378.150 for info on how this algorithm is implemented, if you play with the demo on desmos then you can get a feel for how it compresses at different required degrees of compression. Ultimately this sort of issue is content dependent so there is no single number that is going to work (other than having sufficient brightness to not have to compress much)
murray:
why dont I see much difference in brightness when I change target peek nits?
Also I have many double versions of films, e.g. one print BD 1080 and the same film in HDR. I can never get the HDR version to the same brightness as the SDR version, what am I doing wrong???
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