Edit Image in Gimp
Anime Studio Script
Download Edit in Gimp script v.0.9
Select an image layer and run this script, the image is then opened in Gimp for editing. After you’re done the image gets updated to the edited version.
Installation: Place the script in your /scripts/menu/Image -foder.
With Linux it should work out of the box.
With Windows you may have to change the path to your Gimp-installation in the script if Gimp doesn’t start when you run the script. Just open it up with a text-editor and change the path where I’ve noted.