Manual: pamsharpmap

Pamsharpmap User Manual(1)			   General Commands Manual			  Pamsharpmap User Manual(1)

NAME
       pamsharpmap - create map of sharpness in a PNM/PAM image

SYNOPSIS
       pamsharpmap [imagefile]

DESCRIPTION
       This program is part of Netpbm(1).

       pamsharpmap reads a Netpbm image (PNM or PAM) and produces an image that shows how sharp it is at each location.

       Sharpness  is a measure of how suddenly (in space) colors change in the image.  pamsharpmap 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.

       pamsharpmap  computes  sharpness	 at  a point simply as the average difference in intensity between the pixel at that
       point and the 8 pixels surrounding it.

       At the edges of the image, where there are not 8 pixels surrounding a pixel, pamsharpmap assumes	 the  image  is	 ex‐
       tended with a black border.

       pamsharpmap  assumes  that  the	image  is a PNM or PNM equivalent PAM.	If it isn't, the results are not necessarily
       meaningful.

       The output image is the same dimensions, depth, and tuple type as the input, and has maxval 255.

OPTIONS
       There are no command line options defined specifically for pamsharpmap, but it recognizes the options common  to	 all
       programs based on libnetpbm (See	 Common Options .)

SEE ALSO
       pamsharpness(1), pammasksharpen(1), pamedge(1), pam(1), pnm(1)

HISTORY
       pamsharpmap  was added to Netpbm in Release 10.21 (March 2004).	Bryan Henderson derived it from the program pnmsharp
       by B.W. van Schooten and distributed as part of the Photopnmtools package.

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

	      http://netpbm.sourceforge.net/doc/pamsharpmap.html

netpbm documentation				      07 February 2004				  Pamsharpmap User Manual(1)