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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
| commit | 1017cbebe5d5edd859e0fddad0a8600f509f4821 (patch) | |
| tree | 78bdf336648566f7a7d55f42837357dea3dd674c /jbigtopnm.html | |
| parent | 16f2ac126651015a376eba864a3a35f738b0b25a (diff) | |
| download | netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.gz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.xz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.zip | |
Place user guide into Subversion repository
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8
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diff --git a/jbigtopnm.html b/jbigtopnm.html new file mode 100644 index 00000000..4d92d1a0 --- /dev/null +++ b/jbigtopnm.html @@ -0,0 +1,129 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Jbigtopnm User Manual</TITLE></HEAD> +<BODY> +<H1>Jbigtopnm</H1> +Updated: 19 November 2003 +<BR> +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> +jbigtopnm - JBIG to PNM image file converter + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>jbigtopnm</B> +[<I>options</I>] +[<I>input-file</I> [<I>output-file</I>]] + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>jbigtopnm</b> 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. + +<P>JBIG is a highly effective lossless compression algorithm for +bi-level images (one bit per pixel), which is particularly suitable +for scanned document pages. + +<P>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 <B>-x</B> and <B>-y</B> 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. + +<A NAME="lbAE"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> + +<DT><B>-x</B> <I>number</I> + +<DD>Decode only up to the largest resolution layer which is still not +more than <I>number</I> pixels wide. If no such resolution layer +exists, then use the smallest one available. + +<DT><B>-y</B><I> number</I> + +<DD>Decode only up to the largest resolution layer which is still not +more than <I>number</I> pixels high. If no such resolution layer +exists, then use the smallest one available. You can also use options +<B>-x</B> and <B>-y</B> together which selects the largest layer that +satisfies both limits. + +<DT><B>-b</B> + +<DD>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. + +<DT><B>-d</B> + +<DD>Diagnose a BIE. With this option, <B>jbigtopnm</B> only prints a +summary of the header information found in the input file and then +exits. + +<DT><B>-p</B><I> number</I> + +<DD>If the input contains multiple bitplanes, then extract only the +specified single plane as a PBM file. The first plane has number 0. + +</DL> + +<A NAME="lbAF"> </A> +<H2>STANDARDS</H2> + +<p>This program implements the JBIG image coding algorithm as +specified in ISO/IEC 11544:1993 and ITU-T T.82(1993). + +<A NAME="lbAG"> </A> +<H2>AUTHOR</H2> + +<!-- jbgtopnm below is not a typo. It is not meant to be jbigtopnm --> +<p><B>jbigtopnm</B> is based on the JBIG library by Markus Kuhn, part +of his <a +href="http://www.cl.cam.ac.uk/~mgk25/jbigkit/"><B>JBIG-KIT</B> +package</a>. The <B>jbgtopbm</B> program is part of the +<B>JBIG-KIT</B> package. + +<P><B>jbigtopnm</B> is part of the Netpbm package of graphics tools. + +<A NAME="lbAH"> </A> +<H2>SEE ALSO</H2> + +<B><A HREF="pnm.html">pnm</A></B>, +<B><A HREF="pnmtojbig.html">pnmtojbig</A></B> + +<A NAME="lbAI"> </A> +<H2>LICENSE</H2> + +If you use <B>jbigtopnm</B>, 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. + +<HR> +<A NAME="index"> </A><H2>Table Of Contents</H2> +<UL> +<LI><A HREF="#lbAB">NAME</A> +<LI><A HREF="#lbAC">SYNOPSIS</A> +<LI><A HREF="#lbAD">DESCRIPTION</A> +<LI><A HREF="#lbAE">OPTIONS</A> +<LI><A HREF="#lbAF">STANDARDS</A> +<LI><A HREF="#lbAG">AUTHOR</A> +<LI><A HREF="#lbAH">SEE ALSO</A> +<LI><A HREF="#lbAI">LICENSE</A> +</UL> +</BODY> +</HTML> + + |