This patch does declared work in avoiding unnecessary color conversion
in lossless mode.

But it doesn't fix none of my issues. I've got my profile reset before
testing. First export in lossy mode gave me a set of very little files
of very bad quality, 300-600 kb for 20Mpx+ images. Then I just moved
quality slider forth and back leaving it at default 95% and it worked.
So, probably Sturm Flut is right about nature of this problem.

Regarding last issue, quality slider in lossless mode — nothing's
changed. It is there.

Regards,

Timur. 

On Sun, 2018-12-16 at 22:05 +0100, Pascal Obry wrote:
> Hi Timur,
> 
> > Couple issues I noticed recently while playing with WebP export:
> > 
> > 1. Default settings (95%, lossy) provides rather mediocre results
> > and
> > IMO is unusable. Probably something higher should be used.
> > 2. Lossless settings should hide quality slider because it makes
> > zero
> > difference for the end image.
> 
> There is a PR waiting integration made recently.
> 
> https://github.com/darktable-org/darktable/pull/1866
> 
> You may want to test it and report if it solves your issues.
> 
> If it is the case please report on this PR.
> 
> Thanks,
> 
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