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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
| commit | 1017cbebe5d5edd859e0fddad0a8600f509f4821 (patch) | |
| tree | 78bdf336648566f7a7d55f42837357dea3dd674c /ppmdist.html | |
| parent | 16f2ac126651015a376eba864a3a35f738b0b25a (diff) | |
| download | netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.gz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.xz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.zip | |
Place user guide into Subversion repository
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'ppmdist.html')
| -rw-r--r-- | ppmdist.html | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/ppmdist.html b/ppmdist.html new file mode 100644 index 00000000..0cdcc0d3 --- /dev/null +++ b/ppmdist.html @@ -0,0 +1,88 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Ppmdist User Manual</TITLE></HEAD> +<BODY> +<H1>ppmdist</H1> +Updated: 22 July 1992 +<BR> +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> + +ppmdist - simplistic grayscale assignment for machine generated, color images + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> + +<B>ppmdist</B> + +[<B>-intensity</B>|<B>-frequency</B>] + +[<I>ppmfile</I>] + +<A NAME="lbAD"> </A> +<H2>DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>ppmdist</b> reads a PPM image as input and performs a simplistic +grayscale assignment intended for use with grayscale or bitmap +printers. + +<P>Often conversion from ppm to pgm will yield an image with contrast +too low for good printer output. The program maximizes contrast +between the gray levels output. + +<P>A ppm input of n colors is read, and a pgm of n gray levels is +written. The gray levels take on the values 0..n-1, while maxval +takes on n-1. + +<P>The mapping from color to stepped grayscale can be performed in +order of input pixel intensity, or input pixel frequency (number of +repetitions). + +<p>This program is helpful only for images with a very small number of +colors. + + +<A NAME="lbAE"> </A> +<H2>OPTIONS</H2> + +<DL COMPACT> +<DT><B>-frequency</B> + +<DD>Sort input colors by the number of times a color appears in the +input, before mapping to evenly distributed graylevels of output. + +<DT><B>-intensity</B> + +<dd>Sort input colors by their grayscale intensity, before mapping to +evenly distributed graylevels of output. This is the default. + +</DL> + +<A NAME="lbAG"> </A> +<H2>SEE ALSO</H2> + +<A HREF="ppmtopgm.html">ppmtopgm</A>, +<A HREF="ppmhist.html">ppmhist</A>, +<A HREF="ppm.html">ppm</A> + +<A NAME="lbAH"> </A> +<H2>AUTHOR</H2> + +Copyright (C) 1993 by Dan Stromberg. + +<HR> +<A NAME="index"> </A> +<H2>Table Of Contents</H2> +<UL> +<LI><A HREF="#lbAB">NAME</A> +<LI><A HREF="#lbAC">SYNOPSIS</A> +<LI><A HREF="#lbAD">DESCRIPTION</A> +<LI><A HREF="#lbAE">OPTIONS</A> +<LI><A HREF="#lbAG">SEE ALSO</A> +<LI><A HREF="#lbAH">AUTHOR</A> +</UL> +</BODY> +</HTML> |