pbmtog3(1) - phpMan

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



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


SYNOPSIS
       pbmtog3 [-reversebits] [-nofixedwidth] [-align8|-align16] [pbmfile]


DESCRIPTION
       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.


OPTIONS
       -reversebits
              This option causes the output to have the bits in every byte reversed so the  least
              significant  bit becomes the most significant bit.  Apparently, there is some ambi-
              guity 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.


       -nofixedwidth
              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.


       -align8

       -align16
              These options say to align output rows to 8-bit or 16-bit boundaries, respectively,
              by adding padding bits in front of EOL codes

              Without these options, pbmtog3 adds no padding and rows may begin and ends anywhere
              within a byte.

              You cannot specify both.

              These options were new in Netpbm 10.79 (June 2017).




SEE ALSO
       g3topbm(1), pamtotiff(1), pbm(1) fax formats(1)



HISTORY
       Before Netpbm 10.79 (June 2017), there was a different program by the same name in Netpbm,
       which  was written by Paul Haeberli <paul AT manray.com> in 1989 and then modified exten-
       sively by others.

       Akira Urushibata <afu AT wta.jp> wrote the current version, with an entirely different
       algorithm, in April 2017 and contributed his work to the public domain.

       The current program is backward compatible with the pre-10.79 version.

DOCUMENT SOURCE
       This  manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master
       documentation is at

              http://netpbm.sourceforge.net/doc/pbmtog3.html

netpbm documentation                      20 April 2017                    Pbmtog3 User Manual(0)

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