File: //usr/share/doc/netpbm-10.35.58/userguide/pamsharpness.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Pamsharpness User Manual</TITLE></HEAD>
<BODY>
<H1>pamsharpness</H1>
Updated: 07 Februrary 2004
<BR>
<A HREF="#index">Table Of Contents</A>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
pamsharpness - measure the sharpness of a PNM/PAM image
<A NAME="lbAC"> </A>
<H2>SYNOPSIS</H2>
<B>pamsharpness</B> [<I>imagefile</I>]
<A NAME="lbAD"> </A>
<H2>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
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.
<A NAME="lbAE"> </A>
<H2>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>
<A NAME="history"> </a>
<h2>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>
<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">SEE ALSO</A>
<LI><A HREF=#history>HISTORY</A>
</UL>
</BODY>
</HTML>