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>.


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