92 lines
2.5 KiB
HTML
92 lines
2.5 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 ppmdist</TITLE>
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</HEAD><BODY>
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<H1>ppmdist</H1>
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Section: User Commands (1)<BR>Updated: 22 July 1992<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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ppmdist - simplistic grayscale assignment for machine generated, color images
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>ppmdist</B>
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[<B>-intensity</B>|<B>-frequency</B>]
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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, performs a simplistic grayscale
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assignment intended for use with grayscale or bitmap printers.
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<P>
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Often conversion from ppm to pgm will yield an image with contrast too
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low for good printer output. The program maximizes contrast between
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the gray levels output.
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<P>
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A ppm input of n colors is read, and a pgm of n gray levels is written.
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The gray levels take on the values 0..n-1, while maxval takes on n-1.
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<P>
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The mapping from color to stepped grayscale can be performed in order
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of input pixel intensity, or input pixel frequency (number of repetitions).
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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"><DT><B>-frequency</B>
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<DD>
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<DD>
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Sort input colors by the number of times a color appears in the input,
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before mapping to evenly distributed graylevels of output.
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<B>-intensity</B>
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Sort input colors by their grayscale intensity, before mapping to evenly
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distributed graylevels of output. This is the default.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>BUGS</H2>
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Helpful only for images with a very small number of colors.
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Perhaps should have been an option to <A HREF="/cgi-bin/man/man2html?1+ppmtopgm">ppmtopgm</A>(1).
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<A HREF="/cgi-bin/man/man2html?1+ppmtopgm">ppmtopgm</A>(1), <A HREF="/cgi-bin/man/man2html?1+ppmhist">ppmhist</A>(1), <A HREF="/cgi-bin/man/man2html?5+ppm">ppm</A>(5)
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<A NAME="lbAH"> </A>
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<H2>AUTHOR</H2>
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Copyright (C) 1993 by Dan Stromberg.
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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="2"><A HREF="#lbAB">NAME</A><DD>
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<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="5"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="6"><A HREF="#lbAF">BUGS</A><DD>
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<DT id="7"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="8"><A HREF="#lbAH">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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