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pbmreduce
!!!pbmreduce
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR
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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.


''pbmreduce'' duplicates a lot of the functionality of
''pgmtopbm;'' you could do something like __pnmscale |
pgmtopbm,__ but ''pbmreduce'' is a lot
faster.


''pbmreduce'' can be used to
''pbmreduce''. You can even
correct the brightness of an image, by using the
__-value__ flag.
!!OPTIONS


By default, the halftoning after the reduction is done via
boustrophedonic Floyd-Steinberg error diffusion; however,
the __-threshold__ 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), pnmscale(1), pgmtopbm(1), pbm(5)
!!AUTHOR


Copyright (C) 1988 by Jef Poskanzer.
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Last edited on Monday, June 3, 2002 6:50:39 pm by "perry"

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