g3topbm (1) - Linux Man Pages

g3topbm: convert a Group 3 fax file into a portable bitmap

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 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 prefix.

REFERENCES

The standard for Group 3 fax is defined in CCITT Recommendation T.4.

BUGS

Probably.

AUTHOR

Copyright (C) 1989 by Paul Haeberli <paul [at] manray.sgi.com>.

SEE ALSO

pbmtog3(1), pbm(5)