gimp-elsamuko
GIMP Octave Plugin
This plugin provides a simple interface between GIMP and GNU Octave.
Means you can edit a picture from GIMP in the high level numerical language Octave:
http://www.gnu.org/software/octave/
Download elsamuko-gimp-octave.c and install it with:
gimptool-2.0 --install elsamuko-gimp-octave.c
You will find it then under Filters → Mathematics → GIMP Octave.
The input/output matrices and the Octave script are stored then in ~/.gimp-octave.
For more interesting examples, download and unzip the filter pack in ~/.gimp-octave.
The filter pack needs the octave-image package which should be available in your repository.
These are from here:
http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/index.html
Søren Hauberg modified the plugin to a version with included terminal:
http://image.diku.dk/hauberg/gimp-octave-terminal/
For example in this image the red layer has been fft-shifted by Octave (needs 5-6 secs for a 1MP image):
