GIMP contrast mask
A selection of tutorials for correcting underwater images taken at less than 5m without a flash, has been added to the Imaging Tips section. These tutorials will also work on normal land based photography. There are three methods demonstrated with links to screenshots on each stage for novice users. The methods demonstrated include contrast masks, grayscale masks and levels & gamma adjustment.
There is also a GIMP script-fu (macro) included for one of the methods.
Continue to contrast mask tutorials