g3topbm - convert a Group 3 fax file into a portable bitmap
Reads a Group 3 fax file as input. Produces a portable bitmap as output.
- 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.
The standard for Group 3 fax is defined in CCITT Recommendation T.4.
Copyright (C) 1989 by Paul Haeberli <firstname.lastname@example.org>.