Please excuse me for not knowing the correct terminology here, but I am looking for a way to use GIMP to adjust the overall coloring of a satellite land image. I'm making custom photo-realistic scenery for MS Flight Simulator X, and am running into inconsistent color of adjoining imagery gathered from satellite servers. Attached is an example of what I have to deal with and would like to fix. In the real world this area would all be colored more like that on the right. The satellite image somehow added the red tint. I'd like to make the 'red part' look more like the (correct coloring in the) green part. Since there are so many tiny blocks of different shades of color (farm fields, etc.) I don't know of any way to do this short of selecting and playing with the color of each field, and obviously that isn't something I want to think about. I have tried selecting and editing the red part, but when I try to make the image more green it causes some of the greens in this reddened area to 'blow out' and be way to over-saturated and sometimes look like dayglo. Is there perhaps some sort of filter I could overlay that might cut down on the redness?