fax2tiff
create a TIFF Class F fax file from raw fax data
see also :
tiffinfo - tiffdither
Synopsis
fax2tiff
[ options ] [ -o output.tif ]
input.raw
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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 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
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.
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 Facsimile
Apparatus for Document Transmission).
The Spirit
of TIFF Class F, an appendix to the TIFF 5.0
specification prepared by Cygnet Technologies.
tiffinfo ,
tiffdither , tiffgt,
libtiff
Libtiff library
home page: http://www.remotesensing.org/libtiff/