cyan

This script simulates the 2 Color Technicolor effect.
Copy it into the scripts folder from GIMP, you will find it then under Colors -> Technicolor 2 Color.
Examples:
http://www.flickr.com/photos/28653536@N07/2843204731/
http://www.flickr.com/photos/28653536@N07/2843166878/

To reduce the effects of Purple Fringing or Chromatic Aberration in high contrast areas of an affected photograph.

Guide to Using the Purple Fringe Script