These are the resources that Jo Hart johart1.edublogs.org
and I used in the graphic manipulation Elluminate session on 24 April 2009.
PhotoFiltre
http://photofiltre.free.fr/download_en.htm
Lots of features
Easy to use
Good starting point for people who are new to this
Windows only
Runs quickly
Will run on most computers
GIMP
http://www.gimp.org/downloads/
Fully [...]
