fax2tiff



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 resul-
       tant image is a set of low resolution (98 lines/inch) or medium resolu-
       tion  (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 resolu-
              tion 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).

       -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 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

       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).



                               February 27, 2003                   FAX2TIFF(1)

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