From 1017cbebe5d5edd859e0fddad0a8600f509f4821 Mon Sep 17 00:00:00 2001 From: giraffedata Date: Mon, 25 Dec 2006 03:06:05 +0000 Subject: Place user guide into Subversion repository git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8 --- jbigtopnm.html | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 jbigtopnm.html (limited to 'jbigtopnm.html') diff --git a/jbigtopnm.html b/jbigtopnm.html new file mode 100644 index 00000000..4d92d1a0 --- /dev/null +++ b/jbigtopnm.html @@ -0,0 +1,129 @@ + +Jbigtopnm User Manual + +

Jbigtopnm

+Updated: 19 November 2003 +
+Table Of Contents + +  +

NAME

+jbigtopnm - JBIG to PNM image file converter + +  +

SYNOPSIS

+ +jbigtopnm +[options] +[input-file [output-file]] + +  +

DESCRIPTION

+ +

This program is part of Netpbm. + +

jbigtopnm reads a JBIG bi-level image entity (BIE) from a +file or standard input, decompresses it, and outputs a PBM or PGM +file. If the input has one plane, or you choose just one plane of it, +the output is PBM. Otherwise, the output is PGM. + +

JBIG is a highly effective lossless compression algorithm for +bi-level images (one bit per pixel), which is particularly suitable +for scanned document pages. + +

A JBIG encoded image can be stored in several resolutions in one or +several BIEs. All resolution layers except the lowest one are stored +efficiently as differences to the next lower resolution layer. You +can use options -x and -y to stop the decompression at a +specified maximal output image size. The input file can consist of +several concatenated BIEs which contain different increasing +resolution layers of the same image. + +  +

OPTIONS

+ +
+ +
-x number + +
Decode only up to the largest resolution layer which is still not +more than number pixels wide. If no such resolution layer +exists, then use the smallest one available. + +
-y number + +
Decode only up to the largest resolution layer which is still not +more than number pixels high. If no such resolution layer +exists, then use the smallest one available. You can also use options +-x and -y together which selects the largest layer that +satisfies both limits. + +
-b + +
Use binary values instead of Gray code words in order to decode +pixel values from multiple bitplanes. This option has effect only if +the input has more than one bitplane and you don't select just one of +those bitplanes. Note that the decoder has to be used in the same +mode as the encoder and cannot determine from the BIE, whether Gray or +binary code words were used by the encoder. + +
-d + +
Diagnose a BIE. With this option, jbigtopnm only prints a +summary of the header information found in the input file and then +exits. + +
-p number + +
If the input contains multiple bitplanes, then extract only the +specified single plane as a PBM file. The first plane has number 0. + +
+ +  +

STANDARDS

+ +

This program implements the JBIG image coding algorithm as +specified in ISO/IEC 11544:1993 and ITU-T T.82(1993). + +  +

AUTHOR

+ + +

jbigtopnm is based on the JBIG library by Markus Kuhn, part +of his JBIG-KIT +package. The jbgtopbm program is part of the +JBIG-KIT package. + +

jbigtopnm is part of the Netpbm package of graphics tools. + +  +

SEE ALSO

+ +pnm, +pnmtojbig + +  +

LICENSE

+ +If you use jbigtopnm, you are using various patents, +particularly on its arithmetic encoding method, and in all probability +you do not have a license from the patent owners to do so. + +
+ 

Table Of Contents

+ + + + + -- cgit 1.4.1