Adobe PHOTOSHOP 5.0 User Manual page 240

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CORRECTING THE COLOR PLATES Once you have identified the color balance problem in an image, it's
easy to correct the problem using Curves. These examples show common color balance problems in an
image along with the Curves adjustment needed to correct the problem. You can also use the color wheel
to help you identify the cause of a color problem. For example, too much red in an image may be caused
by too much magenta (as shown in the third example in the second row) or it may be caused by too little
of red's opposing color on the color wheel, cyan (as shown in the second example in the second row).
Similarly, a green cast is often a sign of too little magenta. Use this page and the color wheel on page 225
to help evaluate the color in your own image. See "Adjusting color balance" on page 123.
Corrected image
Heavy in cyan
Weak in magenta
Heavy in black
Weak in cyan
Heavy in yellow
Weak in black
Heavy in magenta
Weak in yellow