Hi there,

I've (vastly) improved the color aberration auto-correction algorithm.
Color correction is now almost perfect (precise roughly to the 10th of
pixel) for all the pictures it tested it on. But the new code needs
more testing, especially on pictures from other cameras.

You can get it here:
  git pull https://github.com/sgimenez/darktable.git cacorrect

And here's the first commit:
  
https://github.com/sgimenez/darktable/commit/e201b2250bfa1eb033f3c1497779396e37e237bd

If you give me some help for testing, I'll try to further improve
performance and initiate a pull request.

Cheers,
Stéphane

Notes:

1. Currently, the correction is only applied on export.
   Use the following to activate it in the GUI:
     plugins/darkroom/cacorrect/display=1

2. Visual hints of the applied corrections may be produced. A red (or
   respectively blue) is shown where the applied color shift has a norm
   close to 0.0, 0.5, 1.0, 1.5, etc. (in pixels). Green dots mark the
   weight of the surrounding area that was used for color shift
   calculations. Activate those indicators with:
     plugins/darkroom/cacorrect/visuals=1

3. The legacy algorithm is still available for comparison purposes with:
     plugins/darkroom/cacorrect/legacy=1




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