Pbmtog3 User Manual(0) Pbmtog3 User Manual(0)
pbmtog3 - convert a PBM image into a Group 3 fax file
pbmtog3 [-reversebits] [-nofixedwidth] [pbmfile]
This program is part of Netpbm(1).
pbmtog3 reads a PBM image as input and produces a Group 3 fax file as
This option causes the output to have the bits in every byte
reversed so the least signficant bit becomes the most signficant
bit. Apparently, there is some ambiguity in transmission proto-
cols so that the bits get reversed on transmission, and this
compensates for that. If you get a whole bunch of "bad code
word" messages when you try to read the G3 file (e.g. with
g3topbm, try using this option. Note that the output is not G3
when you use this option.
Most fax machines expect the image to be 1728 columns wide, so
pbmtog3 cuts the output to this width by default. If you want
to keep the width of the original image, use this option.
This option was new in Netpbm 10.6 (July 2002). Before that,
pbmtog3 always kept the width of the original image.
The standard for Group 3 fax is defined in CCITT Recommendation T.4.
Copyright (C) 1989 by Paul Haeberli <email@example.com>.
netpbm documentation July 2002 Pbmtog3 User Manual(0)
Man(1) output converted with