NAME
       pnminvert - invert a portable anymap
SYNOPSIS
       pnminvert [pnmfile]
DESCRIPTION
       Reads  a  portable  anymap  as  input.   Inverts it black for white and
       produces a portable anymap as output.
SEE ALSO
       pnm(5)
AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.
                                08 August 1989                    pnminvert(1)