Use color balance to affect areas that have a color cast, like too much blue in the shadows, too much green in a fluorescent-lit area. Adjust the sliders until you see the colors you want. This is not a precise science. Make extreme adjustments to see if you are going in the right direction. Often a combination of color changes will give the right look to your selection, and sometimes the combinations can be surprising.
Saturation is a powerful color adjustment tool.
Sometimes, a reduction in saturation will make a problem color disappear with no other changes needed. Increased saturation is most often needed when dealing with weak shadow areas. Adjust them for the correct brightness and color balance first, then bring up the saturation. This can really help to make skin tones more natural or bring in shaded foreground detail in a landscape shot. Rob Sheppard is Editor of PCPhoto and Outdoor Photography magazines.