g3topbm Man page

g3topbm General Commands Manual g3topbm

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 out‐
put.

OPTIONS

-kludge
Tells g3topbm to ignore the first few lines of the file; some‐
times 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, pbm(5)

AUTHOR

Copyright (C) 1989 by Paul Haeberli .

02 October 1989 g3topbm

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