fax2tiff - create a TIFF Class F fax file from raw fax data
fax2tiff [ options ] [ -o output.tif ]
input.raw
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 padded 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 specifications. 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 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.
- -M
- Treat input data as having bits filled from most significant bit
(MSB) to most least bit (LSB).
- -L
- Treat input data as having bits filled from least significant 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 pixels.
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 version of the CCITT
Group 3 Huffman encoding algorithm.
- -6
- Force output to be encoded with the 2-dimensional version 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 padding"
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.
- -f
- Generate TIFF Class F (TIFF/F) format (default).
- -m
- Force output data to have bits filled from most significant bit
(MSB) to most least bit (LSB).
- -l
- Force output data to have bits filled from least significant bit
(LSB) to most significant bit (MSB) (default).
- -r
- Specify the number of rows (scanlines) in each strip of data written to
the output file. By default (or when value 0 is specified),
tiffcp attempts to set the rows/strip that no more than 8 kilobytes
of data appear in a strip (with except of G3/G4 compression schemes). If
you specify special value -1 it will results in infinite number of
the rows per strip. The entire image will be the one strip in that case.
This is default in case of G3/G4 output compression schemes.
- -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.
The following warnings and errors come from the decoding routines
in the library.
"Warning, %s: Premature EOL at scanline %d (x
%d).en":
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).en":
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 %den":
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.en":
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.
Input data are assumed to have a a "top left"
orientation; it should be possible to override this assumption from the
command line.
"CCITT Recommendation T.4" (Standardization of Group 3
Facsimile Apparatus 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 (3tiff)
1988-2024, LibTIFF contributors