Pbmtog3 User Manual
Section: Misc. Reference Manual Pages (0)
Updated: July 2002
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pbmtog3 - convert a PBM image into a Group 3 fax file
This program is part of
pbmtog3 reads a PBM image as input and produces a Group 3
fax file as output.
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 protocols 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 <firstname.lastname@example.org>.
- SEE ALSO
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