g3topbm (1)

SYNOPSIS

g3topbm [ -kludge ] [ -reversebits ] [ -stretch ] [ g3file ]

DESCRIPTION

Reads a Group 3 fax file as input. "Group 3 fax" fax 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.

SEE ALSO

- pbmtog3 (1) - - pbm (5) -

AUTHOR

Copyright (C) 1989 by Paul Haeberli <paul@manray.sgi.com>.