pnminvert man page on CentOS

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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)
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