SYNOPSIS
pamsharpness [imagefile]


DESCRIPTION
This program is part of Netpbm.

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 aver-
age 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, pammasksharpen, pam, pnm


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 Februrary 2004 Pamsharpness User Manual(0)