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 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..." (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 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).

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  pack-
       age, but it's a complete re-write. No code is copied.

greenie                                                              27 Oct 93                                                           g32pbm(1)