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 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(1), tiffdither(1), tiffgt(1), libtiff(3) Libtiff library home page: http://www.simplesystems.org/libtiff/
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
