pnminvert man page
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.
Copyright (C) 1989 by Jef Poskanzer.
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at
pamarith(1), pamfunc(1), pbmmask(1), pnmpaste(1).