"Most digital cameras do a good job of figuring out the
correct white balance. But tricky lighting conditions or wrong
white balance settings can result in a less than perfect photo. The
GIMP provides an easy fix for that: choose Colors -> Auto ->
White Balance, and the application does the rest.
"The red eyes problem is the bane of many point-and-shoot
cameras. If your camera doesn't have an automatic red eye removal
feature, you can use the Filters -> Enhance -> Red Eye
Removal command in the GIMP for that."