pnmgamma - perform gamma correction on a portable anymap


SYNOPSIS

       pnmgamma value [pnmfile]
       pnmgamma redvalue greenvalue bluevalue [pnmfile]


DESCRIPTION

       Reads  a portable anymap as input.  Performs gamma correc­
       tion, and produces a portable anymap as output.

       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.


SEE ALSO

       pnm(5)


AUTHOR

       Copyright (C) 1991 by Bill Davidson and Jef Poskanzer.


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