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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OPTIONS

30       There  are  no command line options defined specifically for pnminvert,
31       but it recognizes the options common to all programs based on libnetpbm
32       (See
33        Common Options ⟨index.html#commonoptions⟩ .)
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SEE ALSO

37       pnm(1)
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AUTHOR

41       Copyright (C) 1989 by Jef Poskanzer.
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DOCUMENT SOURCE

44       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
45       source.  The master documentation is at
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47              http://netpbm.sourceforge.net/doc/pnminvert.html
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49netpbm documentation            08 August 1989        Pnminvert User Manual(0)