pnminvert man page

pnminvert — invert a PNM image





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.

See Also



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


Referenced By

pamarith(1), pamfunc(1), pbmmask(1), pnmpaste(1).

Explore man page connections for pnminvert(1).

netpbm documentation 08 August 1989