NAME
    pnminvert - invert a portable anymap

SYNOPSIS
    pnminvert [pnmfile]

DESCRIPTION
    Reads a portable anymap as input. Inverts it black for white and pro-
    duces a portable anymap as output.

SEE ALSO
    pnm(5)

AUTHOR
    Copyright (C) 1989 by Jef Poskanzer.