pnminvert

Pnminvert User Manual(0)                              Pnminvert User Manual(0)

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  com-
       plementary  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.

SEE ALSO

       pnm(1)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.



netpbm documentation            08 August 1989        Pnminvert User Manual(0)