pnminvert - invert a PNM image

       Copyright (C) 1989 by Jef Poskanzer.

       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.

       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                         PnminvertUserManual(1)

       pnminvert - invert a PNM image

       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 .)

pnm(1)

pnminvert

       [pnmfile]