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1995-02-13
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g3topbm(1) PBM Plus 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 bit-
map as output.
The -kludge flag tells g3topbm to ignore the first few lines
of the file; sometimes FAX files have some junk at the
beginning.
The -reversebits flag 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.
The -stretch flag tells g3topbm to stretch the image verti-
cally 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 Recommenda-
tion T.4.
SEE ALSO
pbmtog3(1), pbm(5)
AUTHOR
Copyright (C) 1989 by Paul Haeberli <paul@manray.sgi.com>.
Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without
fee is hereby granted, provided that the above copyright
notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting docu-
mentation. This software is provided "as is" without
express or implied warranty.
Printed 5/25/90 02 October 1989 1