|Pnminvert User Manual(1)||General Commands Manual||Pnminvert User Manual(1)|
pnminvert - invert a PNM image
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.
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 .)
Copyright (C) 1989 by Jef Poskanzer.
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at
|08 August 1989||netpbm documentation|