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1 perry 1 pbmreduce
2 !!!pbmreduce
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 SEE ALSO
8 AUTHOR
9 ----
10 !!NAME
11
12
13 pbmreduce - read a portable bitmap and reduce it N times
14 !!SYNOPSIS
15
16
17 __pbmreduce__ [[__-floyd__|__-fs__|__-threshold__
18 ] [[__-value__ ''val''] ''N''
19 [[''pbmfile'']
20 !!DESCRIPTION
21
22
23 Reads a portable bitmap as input. Reduces it by a factor of
24 ''N'', and produces a portable bitmap as
25 output.
26
27
28 ''pbmreduce'' duplicates a lot of the functionality of
29 ''pgmtopbm;'' you could do something like __pnmscale |
30 pgmtopbm,__ but ''pbmreduce'' is a lot
31 faster.
32
33
34 ''pbmreduce'' can be used to
35 ''pbmreduce''. You can even
36 correct the brightness of an image, by using the
37 __-value__ flag.
38 !!OPTIONS
39
40
41 By default, the halftoning after the reduction is done via
42 boustrophedonic Floyd-Steinberg error diffusion; however,
43 the __-threshold__ flag can be used to specify simple
44 thresholding. This gives better results when reducing line
45 drawings.
46
47
48 The __-value__ flag alters the thresholding value for all
49 quantizations. It should be a real number between 0 and 1.
50 Above 0.5 means darker images; below 0.5 means
51 lighter.
52
53
54 All flags can be abbreviated to their shortest unique
55 prefix.
56 !!SEE ALSO
57
58
59 pnmenlarge(1), pnmscale(1), pgmtopbm(1), pbm(5)
60 !!AUTHOR
61
62
63 Copyright (C) 1988 by Jef Poskanzer.
64 ----
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