On Sun, May 18, 2025 at 2:37 AM Mark Filipak <markfilipak.i...@gmail.com> wrote: > > On 16/05/2025 21.48, Andrew Randrianasulu wrote: > > сб, 17 мая 2025 г., 04:32 Mark Filipak <markfilipak.i...@gmail.com>: > ... > >> https://www.cinelerra-gg.org/forum/help-video/francebb-luts-for-space-color-conversions/ > >> > >> Color transfer by LUT, wonderful! > >> ... > >> What do you have for '-vf'? > > > > With bash shell on Slackware 15.0 it works like this from home directory: > > > > -vf > > lut3d=file=/home/guest/botva/src/src/LUTs/HLG_BT2020_to_Linear_BT709.cube > > I tried a few 'cubes'. I was unsure which 'cubes' to use based solely on > their names -- for example, > what does 'linear' mean in this context
As far as I understand "linear" here means linear light, without any gamma curve applied, mostly for further processing? -- but I eventually settled on the following: > > set _BT2100_HDR_PQ_to__BT709_=^ > lut3d=file='BT2100_HDR_PQ_to_BT2020_SDR.cube'^,lut3d=file='BT2020_to_BT709.cube' > ... > -filter_complex^ > "[0:v]%_UHD_TO_HD_%,%_BT2100_HDR_PQ_to__BT709_%,format=yuv420p[v]"^ > -map "[v]"^ > ... > > The result required extensive contrast-brightness-saturation tweaking, so I > obviously don't have the > right formula. Would you care to comment, Andrew? Well, I mostly played around inside cinelerra-gg, so my experience probably not directly transferable to ffmpeg's CLI, but I also noticed I need either Histogram Beizer plugin, or brightness/contrast after just naively applying tonemap alone. I guess zscale + tonemap or libplacebo do more things automagically for different input sources ... > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
