On Sun, 2019-03-10 at 19:07 +0100, Matthieu Moy wrote:
> ----- Original Message -----
> > From: "Vidar Hoel" <[email protected]>
> 
> (Please don't post images as attachments, post a link within your
> message to an image hosted somewhere else)
> 
> > White hair, spots and whiskers seems to get a touch of red, green
> > and blue. I tried different modules in darktable, without any
> > success of
> > removing this "noise(?)"
> 
> This looks a lot like color artefacts due to bad demosaicing. Did you
> try using the amaze algorithm, or vng4? Usually amaze is the best
> (but slow), and VNG4 eliminates more color artefacts at the cost of a
> slightly softer image.
> 

That is demosaicing artifacts. Try VNG4 or, if you're not happy with
softer results, change "match greens" in demosaicing module settings to
"local average". Amaze probably will do better job, but it depends.

Timur.

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