106 lines
2.3 KiB
HTML
106 lines
2.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of ppmdither</TITLE>
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</HEAD><BODY>
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<H1>ppmdither</H1>
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Section: User Commands (1)<BR>Updated: 14 July 1991<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="ixAAB"></A>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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ppmdither - ordered dither for color images
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>ppmdither</B>
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[<B>-dim</B>
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<I>power</I>]
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[<B>-red</B>
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<I>shades</I>]
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[<B>-green</B>
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<I>shades</I>]
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[<B>-blue</B>
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<I>shades</I>]
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[<I>ppmfile</I>]
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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Reads a portable pixmap as input, and applies dithering to it to reduce
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the number of colors used down to the specified number of shades for
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each primary.
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The default number of shades is red=5, green=9, blue=5, for
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a total of 225 colors.
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To convert the image to a binary rgb format
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suitable for color printers, use -red 2 -green 2 -blue 2.
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<P>
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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 id="1"><B>-dim</B><I> power</I>
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<DD>
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The size of the dithering matrix. The dithering matrix is a square whose
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dimension is a power of 2.
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<I>power</I>
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is that power of 2. The default is 4, for a 16 by 16 matrix.
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<DT id="2"><B>-red</B><I> shades</I>
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<DD>
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The number of red shades to be used, including black; minimum of 2.
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<DT id="3"><B>-green</B><I> shades</I>
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<DD>
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The number of green shades to be used, including black; minimum of 2.
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<DT id="4"><B>-blue</B><I> shades</I>
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<DD>
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The number of blue shades to be used, including black; minimum of 2.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<A HREF="/cgi-bin/man/man2html?1+pnmdepth">pnmdepth</A>(1), <A HREF="/cgi-bin/man/man2html?1+ppmquant">ppmquant</A>(1), <A HREF="/cgi-bin/man/man2html?5+ppm">ppm</A>(5)
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<A NAME="lbAG"> </A>
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<H2>AUTHOR</H2>
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Copyright (C) 1991 by Christos Zoulas.
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<P>
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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 id="5"><A HREF="#lbAB">NAME</A><DD>
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<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="9"><A HREF="#lbAF">SEE ALSO</A><DD>
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<DT id="10"><A HREF="#lbAG">AUTHOR</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="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:24 GMT, March 31, 2021
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</BODY>
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</HTML>
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