On Sun, Nov 06, 2022 at 06:30:22PM +0100, Michael Niedermayer wrote: > On Sun, Nov 06, 2022 at 06:09:41PM +0100, Michael Niedermayer wrote: > > On Sat, Nov 05, 2022 at 04:26:02PM +0100, Clément Bœsch wrote: > > > Hi, > > > > > > This patchset essentially fixes a few core problems in these filters and > > > switches to a perceptual model. > > > > > > I've generated a report for each key commit on this (temporary) page: > > > http://big.pkh.me/pal/ (warning: heavy page, ~500M; I did try to add some > > > lazy > > > loading of the images but I'm not sure it's actually working as expected). > > > > i just looked at file00 and 16 and 64 colors with dither for it and they > > look > > different, some areas look better before and some better afterwards > > looked at more of the 16 color cases with dither > (16 colors as i asumed fewer would magnify any issues ) > file 01, IMHO current looks better than last (variance per axis) > file 02, IMHO current looks better than last (variance per axis) > file 03, IMHO VPA looks better but both really are quite off in terms of > color, > thats not the color of the original image. > file 04, VPA is not good thats not the correct color > > It seems th last (variance per axis) is more pale and looses color
So I did a lot of experiments, and the explanation for the desaturated output at low number of colors can be found at the end of this article: http://blog.pkh.me/p/39-improving-color-quantization-heuristics.html I still think it's acceptable to lean toward desaturated colors when reducing the number of colors, but you may disagree. Regards, -- Clément B. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
