1Pbmtog3 User Manual(0) Pbmtog3 User Manual(0)
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6 pbmtog3 - convert a PBM image into a Group 3 MH fax file
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10 pbmtog3 [-reversebits] [-nofixedwidth] [pbmfile]
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14 This program is part of Netpbm(1).
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16 pbmtog3 reads a PBM image as input and produces a Group 3 MH fax file
17 as output.
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19 You can also generate a TIFF file that uses the same encoding inside,
20 with pamtotiff.
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22 There is no program in Netpbm that generates other fax formats, such as
23 MR and MMR, but pamtotiff can generate TIFF files that use those encod‐
24 ings.
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28 -reversebits
29 This option causes the output to have the bits in every byte
30 reversed so the least signficant bit becomes the most signficant
31 bit. Apparently, there is some ambiguity in transmission proto‐
32 cols so that the bits get reversed on transmission, and this
33 compensates for that. If you get a whole bunch of "bad code
34 word" messages when you try to read the G3 file (e.g. with
35 g3topbm, try using this option. Note that the output is not G3
36 when you use this option.
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39 -nofixedwidth
40 Most fax machines expect the image to be 1728 columns wide, so
41 pbmtog3 cuts the output to this width by default. If you want
42 to keep the width of the original image, use this option.
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44 This option was new in Netpbm 10.6 (July 2002). Before that,
45 pbmtog3 always kept the width of the original image.
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51 g3topbm(1), pamtotiff(1), pbm(1) faxformats[1m(1)
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56 Copyright (C) 1989 by Paul Haeberli <paul@manray.sgi.com>.
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60netpbm documentation 03 December 2008 Pbmtog3 User Manual(0)