did you try the defringe module?
http://www.darktable.org/usermanual/ch03s04s04.html.php#defringe
cheers,
jo
On Thu, Jul 16, 2015 at 11:41 AM, Christian Mandel <c.man...@gmx.net> wrote:
> Hi!
>
> I was working on a picture showing a strong (blue) CA effect (I guess
> due to previous editing steps), but only on one edge inside the image. A
> "reflected" edge shows no such effect. My first thought was to use the
> CA correction within the lens correction module. It works perfect on the
> affected edge, but introduces a (red) CA effect on the reflected edge.
> That was the point where I discovered that the lens correction module
> has no mask. For the picture deformations that makes perfect sense, but
> IMHO not for CA correction. For the particular image I think I can get
> rid of the color fringe with different tools, but I would like to read
> your opinion on this topic: would it make sense to introduce a mask for
> the lens correction module (even if it does only affect the CA
> correction) or to move CA correction into its own module with a mask?
>
> Thanks & best regards
>
> Chris
>
>
>
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