Pamsharpness User Manual(1)                          General Commands Manual                          Pamsharpness User Manual(1)

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 compo‐
       nents (R, G, B).

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

       pamsharpness assumes that the image is a PNM or PNM equivalent PAM.  If it isn't, the results are not necessarily meaning‐
       ful.

OPTIONS
       There  are no command line options defined specifically for pamsharpness, but it recognizes the options common to all pro‐
       grams based on libnetpbm (See  Common Options .)

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

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.

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

              http://netpbm.sourceforge.net/doc/pamsharpness.html

netpbm documentation                                     07 February 2004                             Pamsharpness User Manual(1)