.TH pnmgamma 1 "12 January 1991"
.IX pnmgamma
.SH NAME
pnmgamma - perform gamma correction on a portable anymap
.SH SYNOPSIS
.B pnmgamma 
.I value
.RI [ pnmfile ]
.br
.B pnmgamma
.I redvalue greenvalue bluevalue
.RI [ pnmfile ]
.SH DESCRIPTION
Reads a portable anymap as input.
Performs gamma correction,
and produces a portable anymap as output.
.IX "gamma correction"
.PP
The arguments specify what gamma value(s) to use.
A value of 1.0 leaves the image alone, less than one darkens it,
and greater than one lightens it.
.SH "SEE ALSO"
pnm(5)
.SH AUTHOR
Copyright (C) 1991 by Bill Davidson and Jef Poskanzer.
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