Color Grading plug-in, creates a cine image look based on user input. For a
contemporary image look, use complimentary colors in shadows and
highlights. It is also preferable to be used on a somewhat neutral image
(ie pre white balanced) for best control of the final result. If it's
not a raw image balance it before with Color Balance 2 [ http://www.registry.gimp.org/node/24589 ].