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CentOS 7.0 - man page for jbigtopnm (centos section 0)

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 standard input, decom-
       presses 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 res-
       olution	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 avail-
	      able.

       -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 avail-
	      able.  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
       <http://www.cl.cam.ac.uk/~mgk25/jbigkit/>  .  The jbgtopbm 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 encod-
       ing  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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