jbigtopnm man page on CentOS

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Jbigtopnm User Manual(0)			      Jbigtopnm User Manual(0)

NAME
       jbigtopnm - JBIG to PNM image file converter

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

DESCRIPTION
       This program is part of Netpbm(1).

       jbigtopnm reads a JBIG bi-level image entity (BIE) from a file or stan‐
       dard 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  sum‐
	      mary  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 num‐
	      ber 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 ⟨http://www.cl.cam.ac.uk/~mgk25/jbigkit/⟩ .  The  jbg‐
       topbm program is part of the JBIG-KIT package.

       jbigtopnm is part of the Netpbm package of graphics tools.

SEE ALSO
       pnm(1), pnmtojbig(1)

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.

netpbm documentation	       19 November 2003	      Jbigtopnm User Manual(0)
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