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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 /pamsharpmap.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 'pamsharpmap.html')
| -rw-r--r-- | pamsharpmap.html | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/pamsharpmap.html b/pamsharpmap.html new file mode 100644 index 00000000..0cd4c4ed --- /dev/null +++ b/pamsharpmap.html @@ -0,0 +1,79 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Pamsharpmap User Manual</TITLE></HEAD> +<BODY> +<H1>pamsharpmap</H1> +Updated: 07 February 2004 +<BR> + +<A HREF="#index">Table Of Contents</A> + +<A NAME="lbAB"> </A> +<H2>NAME</H2> +pamsharpmap - create map of sharpness in a PNM/PAM image + +<A NAME="lbAC"> </A> +<H2>SYNOPSIS</H2> +<B>pamsharpmap</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>pamsharpmap</b> reads a Netpbm image (PNM or PAM) and produces +an image that shows how sharp it is at each location. + +<p>Sharpness is a measure of how suddenly (in space) colors change in +the image. <b>pamsharpmap</b> computes the sharpness of each +component color (R, G, B) separately and produces a pixel whose +intensity of each component color is directly proportional to the +sharpness of that component color at the same location in the input +image. Thus, at a point where the image is very sharp in its red and +green components, but dull in its blue component, you will see a +yellow pixel in the output. + +<p><b>pamsharpmap</b> computes sharpness at a point simply as the +average difference in intensity between the pixel at that point and +the 8 pixels surrounding it. + +<p>At the edges of the image, where there are not 8 pixels surrounding +a pixel, <b>pamsharpmap</b> assumes the image is extended with a black +border. + +<p><b>pamsharpmap</b> assumes that the image is a PNM or PNM +equivalent PAM. If it isn't, the results are not necessarily +meaningful. + +<p>The output image is the same dimensions, depth, and tuple type as +the input, and has maxval 255. + +<A NAME="lbAE"> </A> +<H2>SEE ALSO</H2> + +<B><A HREF="pamsharpness.html">pamsharpness</A></B>, +<B><A HREF="pammasksharpen.html">pammasksharpen</A></B>, +<B><A HREF="pamedge.html">pamedge</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>pamsharpmap</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> |