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

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

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

       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.

       -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 resolution" 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..."

              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.

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

       g32pbm could be smarter about the image width, at the moment, the maximum width is 1728 pixels, and the maximum
       height is 4300 lines. Everything 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).

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

       g32pbm is Copyright (C) 1993 by Gert Doering, <>. 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)