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FAX2TIFF(1)                                                        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) specifi-
       cation 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 algo-
              rithm (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 algo-
              rithm.

       -6     Force output to be encoded with the 2-dimensional version of the CCITT Group 3  Huffman  encoding  algo-
              rithm (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 corre-
       sponding 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.remotesensing.org/libtiff/



libtiff                        November 2, 2005                    FAX2TIFF(1)