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