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.

OPTIONS

       There are no command line options defined specifically for pamsharpness, but it recognizes
       the options common to all programs based on libnetpbm (See
        Common Options ⟨index.html#commonoptions⟩ .)

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