NAME

       pnminvert - invert a PNM image

SYNOPSIS

       pnminvert

       [pnmfile]

DESCRIPTION

       This program is part of Netpbm(1).

       pnminvert reads a PNM image as input, inverts it black for white, and produces a PNM image as output.

       If  the  image is grayscale, pnminvert replaces a pixel with one of complementary brightness, i.e. if the
       original pixel has gamma-adjusted gray value G, the output pixel has gray value maxval - G.

       If the image is color, pnminvert inverts each individual RGB component the same as for a grayscale image.

OPTIONS

       There are no command line options defined specifically for  pnminvert,  but  it  recognizes  the  options
       common to all programs based on libnetpbm (See  Common Options .)

SEE ALSO

       pnm(1)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

DOCUMENT SOURCE

       This  manual  page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation
       is at

              http://netpbm.sourceforge.net/doc/pnminvert.html

netpbm documentation                             08 August 1989                         Pnminvert User Manual(1)