g3topbm(1)                                             g3topbm(1)

NAME
       g3topbm  -  convert  a  Group  3  fax file into a portable
       bitmap

SYNOPSIS
       g3topbm [-kludge] [-reversebits] [-stretch] [g3file]

DESCRIPTION
       Reads a Group 3 fax file as input.   Produces  a  portable
       bitmap as output.

OPTIONS
       -kludge
              Tells  g3topbm to ignore the first few lines of the
              file; sometimes fax files have  some  junk  at  the
              beginning.

       -reversebits
              Tells  g3topbm  to interpret bits least-significant
              first,  instead  of  the  default  most-significant
              first.   Apparently  some  fax modems do it one way
              and others do it the other way.  If you get a whole
              bunch  of  "bad code word" messages, try using this
              flag.

       -stretch
              Tells g3topbm to stretch the  image  vertically  by
              duplicating  each row.  This is for the low-quality
              transmission mode.

       All flags can be abbreviated to their shortest unique pre-
       fix.

REFERENCES
       The standard for Group 3 fax is defined in CCITT Recommen-
       dation T.4.

BUGS
       Probably.

SEE ALSO
       pbmtog3(1), pbm(5)

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

                         02 October 1989                        1