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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.
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