[FFmpeg-devel] [PATCH] Revert "avfilter/vf_palette(gen|use): support palettes with alpha"

[Soft Works]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
> Clément Bœsch
> Sent: Sunday, October 30, 2022 10:30 PM
> To: FFmpeg development discussions and patches <ffmpeg-
> devel at 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.

Thanks,
softworkz