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       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..." (fax/normal).

              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

       -?     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.