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>Eg., an arbitrary curve that remapped all RGB values >below 128, but didn't touch values greater than or >equal to 128? I must be missing something, but why can't you just define the RGB function below 128 as desired; set an anchor point at (128,128); and maintain the interval 128 to 255 along the diagonal? I'll even send you a sample .ACV file if you like. >And if such a capability existed -- would it lead to visible >artifacts or discontinuities in the image? If I'm right, it would be just like any other curve. Dane - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.