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+========
+pnmcurve
+========
+
+apply tone curves to pnm images.
+Curves are specified as a set of control points of a cubic spline.
+pnmcurve applies the resulting spline curve to the pnm image read
+from stdin and writes the resulting image to stdout.
+The -rgb command line switches allow to apply the curve only to
+selected color channels.
+
+pnmcurve is intended to be used with the flimp 
+(http:www.ecademix.com/JohannesHofmann/flimp.html), but can also be 
+used as a standalone filter.