Color correction is the adjustment of red, green, or blue levels in an image. The color correction filter allows you to adjust the individual levels of red, green, and blue levels from -50 (less red, green, or blue) to +50 (more red, green, or blue).
Each color control allows you to increase or decrease the corresponding color level. In many cases, images that have an undersized hue in one color are easily corrected by adding the complementary color(s).