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 ⟨index.html#commonoptions⟩ .)

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