Pamsharpness User Manual(0)                        Pamsharpness User Manual(0)


       pamsharpness - measure the sharpness of a PNM/PAM image


       pamsharpness [imagefile]


       This program is part of Netpbm(1).

       pamsharpnessreads  a Netpbm image (PNM or PAM) and prints a number that
       tells how sharp it is.

       Sharpness is a measure of how suddenly (in space) colors change in  the
       image.  pamsharpness computes the sharpness of the image as the average
       difference in intensity between each pixel and its 8  surrounding  pix-
       els, in each of the color components (R, G, B).

       pamsharpness  does  not include the edges of the image, where there are
       not 8 pixels surrounding a pixel, in its computation.

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


       pamsharpmap(1), pammasksharpen(1), pam(1), pnm(1)


       pamsharpness  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.

netpbm documentation           07 Februrary 2004   Pamsharpness User Manual(0)

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