g32pbm man page on Oracle

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g32pbm(1)		     mgetty+sendfax manual		     g32pbm(1)

NAME
       g32pbm - convert a Group 3 fax file into a portable bitmap

SYNOPSIS
       g32pbm [-reversebits] [-stretch] [g3file]

DESCRIPTION
       Reads  a	 Group 3 fax file (raw or digifax) as input. If no filename is
       given, stdin is used.  Produces a portable bitmap as output.

OPTIONS
       -r     Tells g32pbm to interpret bits least-significant first,  instead
	      of  the  default	most-significant first ("-reversebits").  Some
	      fax modems do it one way and others do it the other way. If  you
	      get  a  whole  bunch  of "invalid code" messages (nearly one per
	      line), try using this flag.

       -s     Double each horizontal row of the	 fax  file  in	the  pbm  file
	      ("-stretch)".   You can use this to adjust the aspect ratio of a
	      "normal resolution" fax file to match that of  a	"fine  resolu‐
	      tion"  fax  file.	 This might not seem like it belongs here, but
	      it's much faster than  using  pnmscale|pgmtopbm  later.	-s  is
	      activated	 automatically if the file is specified on the command
	      line and its name starts with "fn..." (fax/normal).

       -l(aserjet)
	      Instead of a portable bitmap (PBM), output  HP  laserjet	files,
	      suitable for direct printing on a HP laserjet or desjket.

       -d <dpi>
	      Scale  output to <dpi> dots per inch before printing. Normal FAX
	      resolution is 204x196 dpi (fine mode),  or  204x98  dpi  (normal
	      mode).  In  LaerJet  mode,  only	the values 75, 150 and 300 are
	      allowed for <dpi>.

       -t     turn  image  by  90  degrees  clockwise.	Multiple  -t  commands
	      increase	angle, that is, -t -t will turn it upside down, and so
	      on.

       -?     Print a short command syntax.

REFERENCES
       The standard for Group 3 fax is defined in CCITT Recommendation T.4.

BUGS
       g32pbm could be smarter about the image width, at the moment, the maxi‐
       mum  width is 1728 pixels, and the maximum height is 4300 lines. Every‐
       thing bigger is just cut off.

       Only 'raw' pbm files are created.

       Scaling is too slow.

       Turning is too slow (and not yet fully implemented either).

SEE ALSO
       pbm2g3(1), pbm(5), g3cat(1), sendfax(8), mgetty(1)

AUTHOR
       g32pbm is Copyright (C) 1993 by Gert Doering, <gert@greenie.muc.de>. It
       is  similar  to	the g3topbm program in Jef Poskanzers pbmplus package,
       but it's a complete re-write. No code is copied.

greenie				   27 Oct 93			     g32pbm(1)
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