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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pamsharpness User Manual</title></head>
<body>
<h1>pamsharpness</h1>
Updated: 07 February 2004
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pamsharpness - measure the sharpness of a PNM/PAM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>pamsharpness</b> [<i>imagefile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pamsharpness</b> reads a Netpbm image (PNM or PAM) and prints a
message to Standard Output giving a number that tells how sharp it is.
<p>Sharpness is a measure of how suddenly (in space) colors change in
the image. <b>pamsharpness</b> computes the sharpness of the image as
the average difference in intensity between each pixel and its 8 surrounding
pixels, in each of the color components (R, G, B).
<p><b>pamsharpness</b> does not include the edges of the image, where
there are not 8 pixels surrounding a pixel, in its computation.
<p><b>pamsharpness</b> assumes that the image is a PNM or PNM
equivalent PAM. If it isn't, the results are not necessarily
meaningful.
<h2 id="options">OPTIONS</h2>
<p>There are no command line options defined specifically
for <b>pamsharpness</b>, but it recognizes the options common to all
programs based on libnetpbm (See <a href="index.html#commonoptions">
Common Options</a>.)
<h2 id="seealso">SEE ALSO</h2>
<b><a href="pamsharpmap.html">pamsharpmap</a></b>,
<b><a href="pammasksharpen.html">pammasksharpen</a></b>,
<b><a href="pam.html">pam</a></b>,
<b><a href="pnm.html">pnm</a></b>
<h2 id="history">HISTORY</h2>
<p><b>pamsharpness</b> was added to Netpbm in Release 10.21 (March
2004). Bryan Henderson derived it from the program <b>pnmsharp</b> by
B.W. van Schooten and distributed as part of the Photopnmtools
package.
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#history">HISTORY</a>
</ul>
</body>
</html>
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