Pbmtog3 User Manual(0)                                  Pbmtog3 User Manual(0)


       pbmtog3 - convert a PBM image into a Group 3 fax file


       pbmtog3 [-reversebits] [-nofixedwidth] [pbmfile]


       This program is part of Netpbm(1).

       pbmtog3  reads  a PBM image as input and produces a Group 3 fax file as


              This option causes the output to have the  bits  in  every  byte
              reversed so the least signficant bit becomes the most signficant
              bit.  Apparently, there is some ambiguity in transmission proto-
              cols  so  that  the  bits get reversed on transmission, and this
              compensates for that.  If you get a whole  bunch  of  "bad  code
              word"  messages  when  you  try  to  read the G3 file (e.g. with
              g3topbm, try using this option.  Note that the output is not  G3
              when you use this option.

              Most  fax  machines expect the image to be 1728 columns wide, so
              pbmtog3 cuts the output to this width by default.  If  you  want
              to keep the width of the original image, use this option.

              This  option  was  new in Netpbm 10.6 (July 2002).  Before that,
              pbmtog3 always kept the width of the original image.


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


       g3topbm(1), pbm(1)


       Copyright (C) 1989 by Paul Haeberli <paul@manray.sgi.com>.

netpbm documentation               July 2002            Pbmtog3 User Manual(0)

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