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

       pbmtog3 - convert a PBM image into a Group 3 MH 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 MH fax file as output.

       You can also generate a TIFF file that uses the same encoding inside, with pamtotiff.

       There  is no program in Netpbm that generates other fax formats, such as MR and MMR, but pamtotiff can generate
       TIFF files that use those encodings.

              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 protocols 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 orig-
              inal image.

       g3topbm(1), pamtotiff(1), pbm(1) faxformats(1)

       Copyright (C) 1989 by Paul Haeberli <>.

netpbm documentation           03 December 2008         Pbmtog3 User Manual(0)