151 lines
3.2 KiB
HTML
151 lines
3.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
|
|
<HTML><HEAD><TITLE>Manpage of TIFFMEDIAN</TITLE>
|
|
</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
|
|
<H1>TIFFMEDIAN</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>
|
|
|
|
tiffmedian - apply the median cut algorithm to data in a
|
|
<FONT SIZE="-1">TIFF</FONT>
|
|
file
|
|
<A NAME="lbAC"> </A>
|
|
<H2>SYNOPSIS</H2>
|
|
|
|
<B>tiffmedian</B>
|
|
|
|
[
|
|
<I>options</I>
|
|
|
|
]
|
|
<I>input.tif</I>
|
|
|
|
<I>output.tif</I>
|
|
|
|
<A NAME="lbAD"> </A>
|
|
<H2>DESCRIPTION</H2>
|
|
|
|
<I>tiffmedian</I>
|
|
|
|
applys the median cut algorithm to an
|
|
<FONT SIZE="-1">RGB</FONT>
|
|
image in
|
|
<I>input.tif</I>
|
|
|
|
to generate a palette image that is written to
|
|
<I>output.tif</I>.
|
|
|
|
The generated colormap has, by default, 256 entries.
|
|
The image data is quantized by mapping each
|
|
pixel to the closest color values in the colormap.
|
|
<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,
|
|
and
|
|
<B>zip</B>
|
|
|
|
for Deflate compression.
|
|
By default
|
|
<I>tiffmedian</I>
|
|
|
|
will compress data according to the value of the
|
|
<I>Compression</I>
|
|
|
|
tag found in the source file.
|
|
<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>-C</B>
|
|
|
|
<DD>
|
|
Specify the number of entries to use in the generated colormap.
|
|
By default all 256 entries/colors are used.
|
|
<DT><B>-f</B>
|
|
|
|
<DD>
|
|
Apply Floyd-Steinberg dithering before selecting a colormap entry.
|
|
<DT><B>-r</B>
|
|
|
|
<DD>
|
|
Specify the number of rows (scanlines) in each strip of data
|
|
written to the output file.
|
|
By default,
|
|
<I>tiffmedian</I>
|
|
|
|
attempts to set the rows/strip
|
|
that no more than 8 kilobytes of data appear in a strip.
|
|
</DL>
|
|
<A NAME="lbAF"> </A>
|
|
<H2>NOTES</H2>
|
|
|
|
This program is derived from Paul Heckbert's
|
|
<I>median</I>
|
|
|
|
program.
|
|
<A NAME="lbAG"> </A>
|
|
<H2>SEE ALSO</H2>
|
|
|
|
<I><A HREF="pal2rgb+1.html">pal2rgb</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="tiffcmp+1.html">tiffcmp</A></I>(1),
|
|
|
|
<I><A HREF="libtiff+3">libtiff</A></I>(3)
|
|
|
|
<P>
|
|
|
|
"Color Image Quantization for Frame Buffer Display", Paul
|
|
Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.
|
|
|
|
<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>
|