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Pamsharpmap User Manual(0)			    Pamsharpmap	User Manual(0)

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 differ-
       ence in intensity between the pixel at that point and the 8 pixels sur-
       rounding	it.

       At the edges of the image, where	there are not 8	pixels	surrounding  a
       pixel, pamsharpmap assumes the image is extended	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.

SEE ALSO
       pamsharpness(1),	pammasksharpen(1), pamedge(1), pam(5), pnm(5)

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(0)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | DOCUMENT SOURCE

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