pamsharpness(1) - phpMan

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.   pamsharp-
       ness  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  sur-
       rounding 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(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 Photopnm-
       tools 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(0)

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