pbmreduce
Section: User Commands (1)
Updated: 02 August 1989
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NAME
pbmreduce - read a portable bitmap and reduce it N times
SYNOPSIS
pbmreduce [-floyd|-fs | -threshold] [-value <val>] N [pbmfile]
DESCRIPTION
Reads a portable bitmap as input.
Reduces it by a factor of N, and produces a portable bitmap as output.
By default, the halftoning after the reduction is done via
boustrophedonic Floyd-Steinberg error diffusion; however, the -thresh
flag can be used to specify simple thresholding. This gives better
results when reducing line drawings.
The -value flag alters the thresholding value for all quantizations.
It should be a real number between 0 and 1.
Above 0.5 means darker images; below 0.5 means lighter.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO
pnmenlarge(1), ppmscale(1), pgmtopbm(1), pbm(5)
AUTHOR
Copyright (C) 1988 by Jef Poskanzer.
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation. This software is provided "as is" without express or
implied warranty.
Index
- NAME
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- SYNOPSIS
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- DESCRIPTION
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- SEE ALSO
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- AUTHOR
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