g3topbm - convert a Group 3 fax file into a portable bitmap
2. SYNOPSIS ▲
g3topbm [ -kludge ] [ -reversebits ] [ -stretch ] [ g3file ]
3. DESCRIPTION ▲
Reads a Group 3 fax file as input. Produces a portable bitmap as output.
4. OPTIONS ▲
Tells g3topbm to ignore the first few lines of the file; sometimes fax files have some junk at the beginning.
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.
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 prefix.
5. REFERENCES ▲
The standard for Group 3 fax is defined in CCITT Recommendation T.4.
6. BUGS ▲
7. SEE ALSO ▲
8. AUTHOR ▲
Copyright (C) 1989 by Paul Haeberli <>.