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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.g3

DESCRIPTION
       Fax2tiff	 creates  a  TIFF  file	 containing  CCITT  Group 3 or Group 4
       encoded data from one or more files containing ``raw'' Group 3  encoded
       data  (typically obtained directly from a fax modem).  By default, each
       row of data in the resultant TIFF file is 2-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 gener‐
       ated 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, ``clas‐
       sic'', 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:

       -2     Assume input data is 2-d Huffman encoded.

       -B     Assume input data was encoded with black as 0 and white as 1.

       -L     Treat  input  data  as having bits filled from least significant
	      bit (LSB) to most significant bit (MSB).	(This is the default.)

       -M     Treat input data as having bits filled from most significant bit
	      (MSB) to most least bit (LSB).

       -R     Specify  the  vertical  resolution,  in lines/inch, of the input
	      images.  By default input are assumed to have a vertical resolu‐
	      tion of 196 lines/inch.  If images are low resolution facsimile,
	      a value of 98 lines/inch should be specified.

       -W     Assume input data was encoded with black as 1 and	 white	as  0.
	      (This is the default.)

       Options that affect the output file format are:

       -1     Force  output to be compressed with the 1-dimensional version of
	      the CCITT Group 3 Huffman encoding algorithm.

       -4     Force output to be compressed with the  CCITT  Group  4  Huffman
	      encoding.

       -o     Specify the name of the output file.

       -p     Force  the  last bit of each End Of Line (EOL) code to land on a
	      byte boundary.  This ``zero padding'' will be reflected  in  the
	      contents of the Group3Options tag of the resultant TIFF file.

       -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.

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 value of 1728.  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 horizon‐
       tal 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
       Should not have the constant width 1728 built into it.  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  Appara‐
       tus 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).

			      September 24, 1994		   FAX2TIFF(1)
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