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<title>TIFFDITHER</title>
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</head>
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<body>
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<h1 align=center>TIFFDITHER</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#OPTIONS">OPTIONS</a><br>
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<a href="#NOTES">NOTES</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">tiffdither
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− convert a greyscale image to bilevel using
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dithering</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>tiffdither</b>
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[ <i>options</i> ] <i>input.tif output.tif</i></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>tiffdither</i>
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converts a single channel 8-bit greyscale image to a bilevel
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image using Floyd-Steinberg error propagation with
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thresholding.</p>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−c</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify the
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compression to use for data written to the output file:
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<b>none</b> for no compression, <b>packbits</b> for PackBits
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compression, <b>lzw</b> for Lempel-Ziv & Welch
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compression, <b>zip</b> for Deflate compression, <b>g3</b>
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for CCITT Group 3 (T.4) compression, and <b>g4</b> for CCITT
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Group 4 (T.6) compression. By default <i>tiffdither</i> will
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compress data according to the value of the
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<i>Compression</i> tag found in the source file.</p></td>
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</table>
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<p style="margin-left:22%; margin-top: 1em">The
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<small>CCITT</small> Group 3 and Group 4 compression
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algorithms can only be used with bilevel data.</p>
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<p style="margin-left:22%; margin-top: 1em">Group 3
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compression can be specified together with several
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T.4-specific options: <b>1d</b> for 1-dimensional encoding,
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<b>2d</b> for 2-dimensional encoding, and <b>fill</b> to
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force each encoded scanline to be zero-filled so that the
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terminating EOL code lies on a byte boundary. Group
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3-specific options are specified by appending a
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‘‘:’’-separated list to the
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‘‘g3’’ option; e.g. <b>−c
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g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL
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codes.</p>
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<p style="margin-left:22%; margin-top: 1em"><small>LZW</small>
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compression can be specified together with a
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<i>predictor</i> value. A predictor value of 2 causes each
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scanline of the output image to undergo horizontal
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differencing before it is encoded; a value of 1 forces each
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scanline to be encoded without differencing. LZW-specific
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options are specified by appending a
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‘‘:’’-separated list to the
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‘‘lzw’’ option; e.g. <b>−c
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lzw:2</b> for <small>LZW</small> compression with horizontal
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differencing.</p>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−f</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify the bit
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fill order to use in writing output data. By default,
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<i>tiffdither</i> will create a new file with the same fill
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order as the original. Specifying <b>−f lsb2msb</b>
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will force data to be written with the FillOrder tag set to
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<small>LSB2MSB ,</small> while <b>−f msb2lsb</b> will
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force data to be written with the FillOrder tag set to
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<small>MSB2LSB .</small></p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="3%">
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<p style="margin-top: 1em" valign="top"><b>−t</b></p> </td>
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<td width="8%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Set the threshold
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value for dithering. By default the threshold value is
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128.</p> </td>
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</table>
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2002-10-07 09:47:36 -04:00
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<p style="margin-left:11%; margin-top: 1em">The dither
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algorithm is taken from the <b>tiffmedian</b>(1) program
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(written by Paul Heckbert).</p>
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2002-10-07 09:47:36 -04:00
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>pal2rgb</b>(1),
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<b>fax2tiff</b>(1), <b>tiffinfo</b>(1), <b>tiffcp</b>(1),
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<b>tiff2bw</b>(1), <b>libtiff</b>(3TIFF)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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<hr>
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</body>
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</html>
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