172 lines
3.7 KiB
HTML
172 lines
3.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD><TITLE>Manpage of TIFFDITHER</TITLE>
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</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
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<H1>TIFFDITHER</H1>
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Section: User Commands (1)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
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<BR><A HREF="index.html">Return to Main Contents</A>
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<HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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tiffdither - convert a greyscale image to bilevel using dithering
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>tiffdither</B>
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[
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<I>options</I>
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]
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<I>input.tif</I>
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<I>output.tif</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>tiffdither</I>
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converts a single channel 8-bit greyscale image to a bilevel image
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using Floyd-Steinberg error propagation with threholding.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT><B>-c</B>
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<DD>
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Specify the compression to use for data written to the output file:
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<B>none </B>
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for no compression,
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<B>packbits</B>
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for PackBits compression,
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<B>lzw</B>
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for Lempel-Ziv & Welch compression,
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<B>zip</B>
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for Deflate compression,
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<B>g3</B>
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for CCITT Group 3 (T.4) compression,
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and
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<B>g4</B>
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for CCITT Group 4 (T.6) compression.
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By default
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<I>tiffdither</I>
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will compress data according to the value of the
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<I>Compression</I>
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tag found in the source file.
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<DT><DD>
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The
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<FONT SIZE="-1">CCITT</FONT>
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Group 3 and Group 4 compression algorithms can only
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be used with bilevel data.
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<DT><DD>
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Group 3 compression can be specified together with several
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T.4-specific options:
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<B>1d</B>
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for 1-dimensional encoding,
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<B>2d</B>
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for 2-dimensional encoding,
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and
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<B>fill</B>
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to force each encoded scanline to be zero-filled so that the
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terminating EOL code lies on a byte boundary.
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Group 3-specific options are specified by appending a ``:''-separated
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list to the ``g3'' option; e.g.
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<B>-c g3:2d:fill</B>
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to get 2D-encoded data with byte-aligned EOL codes.
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<DT><DD>
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<FONT SIZE="-1">LZW</FONT>
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compression can be specified together with a
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<I>predictor</I>
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value.
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A predictor value of 2 causes
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each scanline of the output image to undergo horizontal
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differencing before it is encoded; a value
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of 1 forces each scanline to be encoded without differencing.
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LZW-specific options are specified by appending a ``:''-separated
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list to the ``lzw'' option; e.g.
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<B>-c lzw:2</B>
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for
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<FONT SIZE="-1">LZW</FONT>
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compression with horizontal differencing.
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<DT><B>-f</B>
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<DD>
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Specify the bit fill order to use in writing output data.
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By default,
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<I>tiffdither</I>
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will create a new file with the same fill order as the original.
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Specifying
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<B>-f lsb2msb</B>
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will force data to be written with the FillOrder tag set to
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<FONT SIZE="-1">LSB2MSB ,</FONT>
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while
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<B>-f msb2lsb</B>
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will force data to be written with the FillOrder tag set to
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<FONT SIZE="-1">MSB2LSB .</FONT>
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<DT><B>-t</B>
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<DD>
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Set the threshold value for dithering.
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By default the threshold value is 128.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>NOTES</H2>
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The dither algorithm is taken from the
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<I><A HREF="tiffmedian+1.html">tiffmedian</A></I>(1)
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program (written by Paul Heckbert).
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<I><A HREF="pal2rgb+1.html">pal2rgb</A></I>(1),
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<I><A HREF="fax2tiff+1.html">fax2tiff</A></I>(1),
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<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),
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<I><A HREF="tiffcp+1.html">tiffcp</A></I>(1),
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<I><A HREF="tiff2bw+1.html">tiff2bw</A></I>(1),
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<I><A HREF="libtiff+3">libtiff</A></I>(3)
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">OPTIONS</A><DD>
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<DT><A HREF="#lbAF">NOTES</A><DD>
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<DT><A HREF="#lbAG">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="index.html">man2html</A>,
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using the manual pages.<BR>
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Time: 01:31:48 GMT, November 23, 1999
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