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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-dimen-
       sionally 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 decod-
       ing 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 encoun-
       tered 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)
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