Ten Ways to Adjust Color in Photoshop Elements 11
Correct color with the Color Curves command.
The most sophisticated of the color correctors is the Color Curves command. This adjustment attempts to improve the tonal range in color images by making adjustments to highlights, shadows, and midtones in each color channel. Try using this command on images in which the foreground elements appear overly dark due to backlighting. Conversely, the adjustment is also designed to correct images that appear overexposed and washed out.