Re: [Gimp-developer] Purple fringing removal extension

[Alexandre Prokoudine <alexandre prokoudine gmail com>]

On Sun, Jul 15, 2012 at 2:51 AM, Robert Krawitz <rlk alum mit edu> wrote:

> That fixes lateral chromatic aberration (the focal length, or image
> magnification, is different for different wavelengths but the focal
> plane is the same).  Purple fringing is caused by longitudinal chromatic
> aberration (the focal plane is different for different wavelengths).
> It's a different lens defect and is much more difficult to fix (stopping
> down reduces the problem, since it increases depth of field, but there
> are often reasons why you don't want to do that).

Aha, thanks for clarification! :)

@Martin

> Yes, but it's written in OCaml and I expect to rewrite it completely in
> order to fit in the gimp dev environment.

That would be C and, preferably, as a GEGL operation :)

Alexandre Prokoudine
http://libregraphicsworld.org