1Pnminvert User Manual(0)                              Pnminvert User Manual(0)
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NAME

6       pnminvert - invert a PNM image
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SYNOPSIS

10       pnminvert
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12       [pnmfile]
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DESCRIPTION

16       This program is part of Netpbm(1).
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18       pnminvert  reads  a PNM image as input, inverts it black for white, and
19       produces a PNM image as output.
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21       If the image is grayscale, pnminvert replaces a pixel with one of  com‐
22       plementary  brightness,  i.e.  if the original pixel has gamma-adjusted
23       gray value G, the output pixel has gray value maxval - G.
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25       If the image is color, pnminvert inverts each individual RGB  component
26       the same as for a grayscale image.
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SEE ALSO

30       pnm(1)
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AUTHOR

34       Copyright (C) 1989 by Jef Poskanzer.
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38netpbm documentation            08 August 1989        Pnminvert User Manual(0)