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<title>FAX2TIFF</title>
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<h1 align=center>FAX2TIFF</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
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<p>fax2tiff − create a <small>TIFF</small> Class F fax
file from raw fax data</p>
</td>
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<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>fax2tiff</b> [ <i>options</i> ] [ <b>−o</b>
<i>output.tif</i> ] <i>input.raw</i></p>
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<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<p><i>Fax2tiff</i> creates a <small>TIFF</small> file
containing <small>CCITT</small> 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
<small>TIFF</small> 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
<small>TIFF</small> Class F ( <small>FAX</small> )
specification for storing facsimile data. This means, in
particular, that each page of the data does <b>not</b>
include the trailing <i>return to control</i> (
<small>RTC</small> ) code; as required for transmission by
the <small>CCITT</small> Group 3 specifications. The old,
‘‘classic’’, format is created if
the <b>−c</b> option is used. (The Class F format can
also be requested with the <b>−f</b> option.)</p>
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<p>The default name of the output image is <i>fax.tif</i>;
this can be changed with the <b>−o</b> 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.</p>
</td>
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<a name="OPTIONS"></a>
<h2>OPTIONS</h2>
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<p>Options that affect the interpretation of input data
are:</p>
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<p><b>−3</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is <small>CCITT</small> Group 3
encoded (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−4</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is <small>CCITT</small> Group 4
encoded.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−U</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is uncompressed (Group 3 or Group
4).</p>
</td>
<td width="0%">
</td>
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<td width="10%"></td>
<td width="3%">
<p><b>−1</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is encoded with the 1-dimensional
version of the <small>CCITT</small> Group 3 Huffman encoding
algorithm (default).</p>
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<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−2</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is 2-dimensional version of the
<small>CCITT</small> Group 3 Huffman encoding algorithm.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−P</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is <b>not</b> EOL-aligned (default).
This option has effect with Group 3 encoded input only.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−A</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data is EOL-aligned. This option has effect
with Group 3 encoded input only.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−M</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Treat input data as having bits filled from most
significant bit ( <small>MSB</small> ) to most least bit (
<small>LSB</small> ).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−L</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Treat input data as having bits filled from least
significant bit ( <small>LSB</small> ) to most significant
bit ( <small>MSB</small> ) (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−B</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data was encoded with black as 0 and white
as 1.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−W</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Assume input data was encoded with black as 1 and white
as 0 (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−R</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>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.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−X</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Specify the width, in pixels, of the input images. By
default input are assumed to have a width of 1728
pixels.</p>
</td>
<td width="0%">
</td>
</table>
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<p>Options that affect the output file format are:</p>
</td>
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<p><b>−o</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Specify the name of the output file.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−7</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be compressed with the
<small>CCITT</small> Group 3 Huffman encoding algorithm
(default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−8</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be compressed with the
<small>CCITT</small> Group 4 Huffman encoding.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−u</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be uncompressed (Group 3 or Group
4).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−5</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be encoded with the 1-dimensional
version of the <small>CCITT</small> Group 3 Huffman encoding
algorithm.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−6</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be encoded with the 2-dimensional
version of the <small>CCITT</small> Group 3 Huffman encoding
algorithm (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−a</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force the last bit of each <i>End Of Line</i> (
<small>EOL</small> ) code to land on a byte boundary
(default). This ‘‘zero padding’’
will be reflected in the contents of the
<i>Group3Options</i> tag of the resultant
<small>TIFF</small> file. This option has effect with Group
3 encoded output only.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−p</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Do not EOL-align output. This option has effect with
Group 3 encoded output only.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−c</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Generate "classic" Group 3 TIFF format.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−f</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Generate TIFF Class F (TIFF/F) format (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−m</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output data to have bits filled from most
significant bit ( <small>MSB</small> ) to most least bit (
<small>LSB</small> ).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−l</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output data to have bits filled from least
significant bit ( <small>LSB</small> ) to most significant
bit ( <small>MSB</small> ) (default).</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−r</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Specify the number of rows (scanlines) in each strip of
data written to the output file. By default (or when value
<b>0</b> is specified), <i>tiffcp</i> 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 <b>−1</b> 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.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−s</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Stretch the input image vertically by writing each input
row of data twice to the output file.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−v</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force <i>fax2tiff</i> to print the number of rows of
data it retrieved from the input file.</p>
</td>
<td width="0%">
</td>
<tr valign="top" align="left">
<td width="10%"></td>
<td width="3%">
<p><b>−z</b></p>
</td>
<td width="5%"></td>
<td width="80%">
<p>Force output to be compressed with the LZW encoding.</p>
</td>
<td width="0%">
</td>
</table>
<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
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<p>The following warnings and errors come from the decoding
routines in the library.</p>
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<p><b>Warning, %s: Premature EOL at scanline %d (x
%d).\n</b>. The input data had a row that was shorter than
the expected width. The row is padded with white.</p>
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<p><b>%s: Premature EOF at scanline %d (x %d).\n</b>. The
decoder ran out of data in the middle of a scanline. The
resultant row is padded with white.</p>
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<p><b>%s: Bad code word at row %d, x %d\n</b>. An invalid
Group 3 <i>code</i> 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.</p>
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<p><b>%s: Bad 2D code word at scanline %d.\n</b>. An invalid
Group 4 or 2D Group 3 <i>code</i> 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.</p>
</td>
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<a name="BUGS"></a>
<h2>BUGS</h2>
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<p>Input data are assumed to have a a ‘‘top
left’’ orientation; it should be possible to
override this assumption from the command line.</p>
</td>
</table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<p><b><small>CCITT</small> Recommendation T.4</b>
(Standardization of Group 3 Facsimile Apparatus for Document
Transmission).</p>
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<p><b>The Spirit of TIFF Class F</b>, an appendix to the
TIFF 5.0 specification prepared by Cygnet Technologies.</p>
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<p><b>tiffinfo</b>(1), <b>tiffdither</b>(1),
<b>tiffgt</b>(1), <b>libtiff</b>(3)</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
</td>
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