Man1 - pamsharpness.1

pamsharpness - measure the sharpness of a PNM/PAM image

pamsharpness [/imagefile/]

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.

*pamsharpmap*(1) , *pammasksharpen*(1) , *pam*(5) , *pnm*(5)

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.