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



NAME
       pamsharpness - measure the sharpness of a PNM/PAM image


SYNOPSIS
       pamsharpness [imagefile]


DESCRIPTION
       This program is part of Netpbm(1)

       pamsharpness reads a Netpbm image (PNM or PAM) and prints a message to
       Standard Output giving 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
       pixels, 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.


SEE ALSO
       pamsharpmap(1) , pammasksharpen(1) , pam(5) , pnm(5)



HISTORY
       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 February 2004    Pamsharpness User Manual(0)