convert a Group 3 fax file into a portable bitmap
see also :
[-kludge] [-reversebits] [-stretch]
add an example, a script, a trick and tips
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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
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
1989 by Paul Haeberli <paul[:at:]manray.sgi[:dot:]com>.