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

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

       pamsharpmap [imagefile]

       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 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  max-
       val 255.

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

       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	Photopnm-
       tools package.

netpbm documentation			 07 February 2004	       Pamsharpmap User Manual(0)
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