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