> >>> BT2020_HDR_PQ_to_BT709.cube - this CLUT doesn't exist. That's Ultra >>> Blu-ray HDR input to Blu-ray SDR >>> output -- two colorspaces that are as common as dirt -- but such a CLUT >>> doesn't exist! >>> >>> BT2020_HDR_PQ_to_<something>.cube followed by <something>_to_BT709.cube >>> -- >>> <something> being an >>> intermediate colorspace in common -- but such a <something> doesn't >>> exist. >>> I tried every combination >>> that makes any sense and a few that make no sense. >>> >> >> IIRC you need tonemap related filter for HDR to SDR conversion. >> >> Simple LUT can not do it. >> > > The CinGG CLUTs do everything in one step, so, no, IIRC you don't need to > tonemap because they tonemap. They take input yuv pixels from the input > colorspace and output yuv pixels in the output colorspace. > > IIRC, the missing piece to map from 2084 PQ to SDR may be that you need to know are the maxFALL and maxCLL values to have a frame of reference (your virtual 1.0 clipping point), because the content has rarely been color graded for the theoretical 10,000nt display... _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user
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