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1 perry 1 JBIGTOPNM
2 !!!JBIGTOPNM
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 STANDARDS
8 AUTHOR
9 SEE ALSO
10 LICENSE
11 ----
12 !!NAME
13
14
15 jbigtopnm - JBIG to PNM image file converter
16 !!SYNOPSIS
17
18
19 __jbigtopnm__ [[ ''options'' ] [[ ''input-file'' | -
20 [[ ''output-file'' ]]
21 !!DESCRIPTION
22
23
24 Reads in a ''JBIG'' bi-level image entity (BIE) from a
25 file or standard input, decompresses it, and outputs a PBM
26 or PGM file. If the input has one plane, or you choose just
27 one plane of it, the output is PBM. Otherwise, the output is
28 PGM.
29
30
31 ''JBIG'' is a highly effective lossless compression
32 algorithm for bi-level images (one bit per pixel), which is
33 particularly suitable for scanned document
34 pages.
35
36
37 A ''JBIG'' encoded image can be stored in several
38 resolutions in one or several BIEs. All resolution layers
39 except the lowest one are stored efficiently as differences
40 to the next lower resolution layer. Options __-x__ and
41 __-y__ can be used to stop the decompression at a
42 specified maximal output image size. The input file can
43 consist of several concatenated BIEs which contain different
44 increasing resolution layers of the same image.
45 !!OPTIONS
46
47
48 __-__ A single hyphen instead of an input file name will
49 cause __jbigtopnm__ to read the data from standard input
50 instead from a file.
51
52
53 __-x__ ''number''
54
55
56 Decode only up to the largest resolution layer which is
57 still not more than ''number'' pixels wide. If no such
58 resolution layer exists, then use the smallest one
59 available.
60
61
62 __-y__ ''number''
63
64
65 Decode only up to the largest resolution layer which is
66 still not more than ''number'' pixels high. If no such
67 resolution layer exists, then use the smallest one
68 available. Options __-x__ and __-y__ can also be used
69 together in which case the largest layer that satisfies both
70 limits will be selected.
71
72
73 __-b__ Use binary values instead of Gray code words in
74 order to decode pixel values from multiple bitplanes. This
75 option has only an effect if the input has more than one
76 bitplane and you don't select just one of those bitplanes.
77 Note that the decoder has to be used in the same mode as the
78 encoder and cannot determine from the BIE, whether Gray or
79 binary code words were used by the encoder.
80
81
82 __-d__ Diagnose a BIE. With this option, __jbigtopnm__
83 will only print a summary of the header information found in
84 the input file and then exit.
85
86
87 __-p__ ''number''
88
89
90 If the input contains multiple bitplanes, then extract only
91 the specified single plane as a PBM file. The first plane
92 has number 0.
93 !!STANDARDS
94
95
96 This program implements the ''JBIG'' image coding
97 algorithm as specified in ISO/IEC 11544:1993 and ITU-T
98 T.82(1993).
99 !!AUTHOR
100
101
102 The __jbigtopnm__ is based on the ''JBIG'' library by
103 Markus Kuhn, part of his __JBIG-KIT__ package. The
104 __jbgtopbm__ program is part of the ''JBIG-KIT''
105 package. The most recent version of that library and tools
106 set is freely available on the Internet from anonymous ftp
107 server ftp.informatik.uni-erlangen.de in directory
108 pub/doc/ISO/JBIG/.
109
110
111 __jbigtopnm__ is part of the Netpbm package of graphics
112 tools.
113 !!SEE ALSO
114
115
116 pbm(5),pgm(5),pbmtojbg(1)
117 !!LICENSE
118
119
120 If you use __jbigtopnm__, you are using various patents,
121 particularly on its arithmetic encoding method, and in all
122 probability you do not have a license from the patent owners
123 to do so.
124 ----
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