fax2tiff(1)
FAX2TIFF(1) USER COMMANDS FAX2TIFF(1)
NAME
fax2tiff - create a TIFF Class F fax file from raw fax data
SYNOPSIS
fax2tiff [ options ] [ -o output.tif ] input.raw
DESCRIPTION
Fax2tiff creates a TIFF file containing CCITT Group 3 or
Group 4 encoded data from one or more files containing
``raw'' Group 3 or Group 4 encoded data (typically obtained
directly from a fax modem). By default, each row of data in
the resultant TIFF file is 1-dimensionally encoded and pad-
ded or truncated to 1728 pixels, as needed. The resultant
image is a set of low resolution (98 lines/inch) or medium
resolution (196 lines/inch) pages, each of which is a single
strip of data. The generated file conforms to the TIFF
Class F (FAX) specification for storing facsimile data.
This means, in particular, that each page of the data does
not include the trailing return to control (RTC) code; as
required for transmission by the CCITT Group 3 specifica-
tions. The old, ``classic'', format is created if the -c
option is used. (The Class F format can also be requested
with the -f option.)
The default name of the output image is fax.tif; this can be
changed with the -o option. Each input file is assumed to
be a separate page of facsimile data from the same document.
The order in which input files are specified on the command
line is the order in which the resultant pages appear in the
output file.
OPTIONS
Options that affect the interpretation of input data are:
-3 Assume input data is CCITT Group 3 encoded (default).
-4 Assume input data is CCITT Group 4 encoded.
-U Assume input data is uncompressed (Group 3 or Group 4).
-1 Assume input data is encoded with the 1-dimensional
version of the CCITT Group 3 Huffman encoding algorithm
(default).
-2 Assume input data is 2-dimensional version of the CCITT
Group 3 Huffman encoding algorithm.
-P Assume input data is not EOL-aligned (default). This
option has effect with Group 3 encoded input only.
-A Assume input data is EOL-aligned. This option has
effect with Group 3 encoded input only.
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FAX2TIFF(1) USER COMMANDS FAX2TIFF(1)
-M Treat input data as having bits filled from most signi-
ficant bit (MSB) to most least bit (LSB).
-L Treat input data as having bits filled from least sig-
nificant bit (LSB) to most significant bit (MSB)
(default).
-B Assume input data was encoded with black as 0 and white
as 1.
-W Assume input data was encoded with black as 1 and white
as 0 (default).
-R Specify the vertical resolution, in lines/inch, of the
input images. By default input are assumed to have a
vertical resolution of 196 lines/inch. If images are
low resolution facsimile, a value of 98 lines/inch
should be specified.
-X Specify the width, in pixels, of the input images. By
default input are assumed to have a width of 1728 pix-
els.
Options that affect the output file format are:
-o Specify the name of the output file.
-7 Force output to be compressed with the CCITT Group 3
Huffman encoding algorithm (default).
-8 Force output to be compressed with the CCITT Group 4
Huffman encoding.
-u Force output to be uncompressed (Group 3 or Group 4).
-5 Force output to be encoded with the 1-dimensional ver-
sion of the CCITT Group 3 Huffman encoding algorithm.
-6 Force output to be encoded with the 2-dimensional ver-
sion of the CCITT Group 3 Huffman encoding algorithm
(default).
-a Force the last bit of each End Of Line (EOL) code to
land on a byte boundary (default). This ``zero pad-
ding'' will be reflected in the contents of the
Group3Options tag of the resultant TIFF file. This
option has effect with Group 3 encoded output only.
-p Do not EOL-align output. This option has effect with
Group 3 encoded output only.
-c Generate "classic" Group 3 TIFF format.
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FAX2TIFF(1) USER COMMANDS FAX2TIFF(1)
-f Generate TIFF Class F (TIFF/F) format (default).
-m Force output data to have bits filled from most signi-
ficant bit (MSB) to most least bit (LSB).
-l Force output data to have bits filled from least sig-
nificant bit (LSB) to most significant bit (MSB)
(default).
-s Stretch the input image vertically by writing each
input row of data twice to the output file.
-v Force fax2tiff to print the number of rows of data it
retrieved from the input file.
-z Force output to be compressed with the LZW encoding.
DIAGNOSTICS
The following warnings and errors come from the decoding
routines in the library.
Warning, %s: Premature EOL at scanline %d (x %d).\n. The
input data had a row that was shorter than the expected
width. The row is padded with white.
%s: Premature EOF at scanline %d (x %d).\n. The decoder ran
out of data in the middle of a scanline. The resultant row
is padded with white.
%s: Bad code word at row %d, x %d\n. An invalid Group 3
code was encountered while decoding the input file. The row
number and horizontal position is given. The remainder of
the input row is discarded, while the corresponding output
row is padded with white.
%s: Bad 2D code word at scanline %d.\n. An invalid Group 4
or 2D Group 3 code was encountered while decoding the input
file. The row number and horizontal position is given. The
remainder of the input row is discarded, while the
corresponding output row is padded with white.
BUGS
Input data are assumed to have a a ``top left'' orientation;
it should be possible to override this assumption from the
command line.
SEE ALSO
CCITT Recommendation T.4 (Standardization of Group 3 Fac-
simile Apparatus for Document Transmission).
The Spirit of TIFF Class F, an appendix to the TIFF 5.0
specification prepared by Cygnet Technologies.
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FAX2TIFF(1) USER COMMANDS FAX2TIFF(1)
tiffinfo(1), tiffdither(1), tiffgt(1), libtiff(3).
Last change: February 27, 2003 4
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