fax2tiff(1) User Commands fax2tiff(1)NAMEfax2tiff - create a TIFF Class F fax file from raw fax data
SYNOPSISfax2tiff [options] [-o output.tif] input.g3
DESCRIPTIONfax2tiff creates a TIFF file containing CCITT Group 3 or Group 4
encoded data from one or more files containing "raw" Group 3 encoded
data, typically obtained directly from a fax modem.
By default, each row of data in the resultant TIFF file is 2-dimension‐
ally encoded and padded or truncated to 1728 pixels, as needed. The
resultant image is a set of low resolution (98 lines per inch) or
medium resolution (196 lines per inch) pages, each of which is a single
strip of data.
OPTIONS
Input Data Options
The following input data options are supported:
-2 Assume input data is 2-d Huffman encoded.
-B Assume input data was encoded with black as 0 and white
as 1.
-L Treat input data as having bits filled from least sig‐
nificant bit (LSB) to most significant bit (MSB). This
is the default.
-M Treat input data as having bits filled from most sig‐
nificant bit (MSB) to least significant bit (LSB).
-R Specify the vertical resolution, in lines per inch, of
the input images. By default, input images are assumed
to have a vertical resolution of 196 lines per inch. If
images are low resolution facsimile, specify a value of
98 lines per inch.
-W Assume input data was encoded with black as 1 and white
as 0. This is the default.
Output File Options
The following output file options are supported:
-1 Force output to be compressed with the 1-dimensional
version of the CCITT Group 3 Huffman encoding algo‐
rithm.
-4 Force output to be compressed with the CCITT Group 4
Huffman encoding.
-o Specify the name of the output file.
-p Force the last bit of each End Of Line (EOL) code to
land on a byte boundary. This "zero padding" is
reflected in the contents of the Group3Options tag of
the resultant TIFF file.
-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
retrieved from the input file.
OPERANDS
The following operands are supported:
input.g3 The name of the input file that contains raw fax data.
EXTENDED DESCRIPTION
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 specifications. The old,
"classic" format is created if the -c option is used. The Class F for‐
mat can also be requested with the -f option.
The default name of the output image is fax.tif. You can use the -o
option to change the output filename.
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.
Diagnostics
The following warnings and errors come from the decoding routines in
the library.
Warning, %s: Premature ETheainputndata had(a row.that was shorter than
the expected value of 1728. The row is padded
with white.
%s: Premature EOF at scaThendecoder ran.out of data in the middle of a
scanline. The resultant row is padded with
white.
%s: Bad code word at rowAndinvalid 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 corre‐
sponding output row is padded with white.
%s: Bad 2D code word at AnainvaliddGroup 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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │image/library/libtiff │
├─────────────────────────────┼─────────────────────────────┤
│Interface stability │Uncommitted │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSO
CCITT Recommendation T.4 (Standardization of Group 3 Facsimile Appara‐
tus for Document Transmission).
The Spirit of TIFF Class F, an appendix to the TIFF 5.0 specification
prepared by Cygnet Technologies.
tiffinfo(1), tiffdither(1), tiffgt(1), libtiff(3)NOTES
Updated by Breda McColgan, Sun Microsystems Inc., 2004.
SunOS 5.11 26 Mar 2004 fax2tiff(1)
