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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 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:

     -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  sig-
          nificant  bit  (LSB)  to  most  significant  bit (MSB).
          (This is the default.)

     -M   Treat input data as having bits filled from most signi-
          ficant 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 resolution 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 algo-
          rithm.

     -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 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
     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  Fac-
     simile 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).

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