GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.6 |
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pnminvert(1) |
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pnminvert - invert a PNM image
pnminvert
[pnmfile]
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.
pnm(1)
Copyright (C) 1989 by Jef Poskanzer.
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pnminvert(1) | |