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In my last post I asked: > But is there some trick where you can have a curve that > applies only to tones within a certain range, but doesn't > attempt to remap tones outside that range? Dumb. Answered my own questions shortly after posting this. As far as I can tell: Yes, it's easy to do this with a mask (make the mask using the 'Threshold' tool.) > And if such a capability existed -- would it lead to visible > artifacts or discontinuities in the image? As far as I can tell, Yes (ie., it does lead to similar artifacts as if I'd applied the curve without the mask.) rafe b. - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.