> -----Original Message----- > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of > Soft Works > Sent: Sunday, October 30, 2022 10:41 PM > To: FFmpeg development discussions and patches <ffmpeg- > de...@ffmpeg.org> > Subject: Re: [FFmpeg-devel] [PATCH] Revert > "avfilter/vf_palette(gen|use): support palettes with alpha" > > > > > -----Original Message----- > > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of > > Clément Bœsch > > Sent: Sunday, October 30, 2022 10:30 PM > > To: FFmpeg development discussions and patches <ffmpeg- > > de...@ffmpeg.org> > > Subject: Re: [FFmpeg-devel] [PATCH] Revert > > "avfilter/vf_palette(gen|use): support palettes with alpha" > > > > On Sun, Oct 30, 2022 at 09:19:05PM +0000, Soft Works wrote: > > [...] > > > At the time of submission I did a lot of experiments and the > > results > > > seemed to be very useful: > > > > > > > https://gist.github.com/softworkz/deef5c2a43d3d629c3e17f9e21544a8f > > > > > > > On that page, the result of the command using palette* filters for > > the > > colored "O" gives a broken output, and it's not a simple bug, it's > > more > > fundamental. You cannot just just average the colors with different > > levels > > of alpha, it makes no sense. > > > > Do you understand why or do you need me to elaborate? > > I understand why. I know that it's not perfect. But it's the best > what's achievable within the way the filter is working. > > But I wouldn't go that far as saying it would be "broken". I think > the result is quite acceptable with regards to the method being > using. > > The patch I had submitted doesn't change the previous behavior > without the use_alpha parameter. > And when using the use_alpha parameter, the results are still > useful in many cases - maybe not always. > > But it don't see any reason to remove this just because it's not > perfect. If you would have a patch to improve the results - that > would be a different story and of course very welcome.
I'm really not an expert in image processing algorithms, and I haven't tried the following yet: Do you think it might make sense to put more weight on the alpha value by tripling it? So it would be weighted equally to the RGB value? softworkz _______________________________________________ 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".
