This technique requires color correction experience and some knowledge of the RGB color wheel.
Choose Enhance > Adjust Lighting > Levels.
Choose Layers > New Adjustment Layer > Levels, or open an existing Levels adjustment layer.
Red to add red or cyan to the image.
Green to add green or magenta to the image.
Blue to add blue or yellow to the image.
You can use the gray eyedropper in the
Levels dialog box to quickly remove a color cast. Double-click the
eyedropper and make sure that the RGB values are equal. After you
close the Color Picker, click an area in your image that should
be a neutral gray.