NAME

       pamsharpmap - create map of sharpness in a PNM/PAM image

SYNOPSIS

       pamsharpmap [imagefile]

DESCRIPTION

       This program is part of Netpbm(1).

       pamsharpmap  reads  a  Netpbm image (PNM or PAM) and produces an image that shows how sharp it is at each
       location.

       Sharpness is a measure of how suddenly (in space) colors change in the image.  pamsharpmap  computes  the
       sharpness  of  each  component  color  (R,  G, B) separately and produces a pixel whose intensity of each
       component color is directly proportional to the sharpness of that component color at the same location in
       the input image.  Thus, at a point where the image is very sharp in its red  and  green  components,  but
       dull in its blue component, you will see a yellow pixel in the output.

       pamsharpmap computes sharpness at a point simply as the average difference in intensity between the pixel
       at that point and the 8 pixels surrounding it.

       At  the  edges  of  the  image, where there are not 8 pixels surrounding a pixel, pamsharpmap assumes the
       image is extended with a black border.

       pamsharpmap assumes that the image is a PNM or PNM equivalent PAM.  If it  isn't,  the  results  are  not
       necessarily meaningful.

       The output image is the same dimensions, depth, and tuple type as the input, and has maxval 255.

OPTIONS

       There  are  no  command  line options defined specifically for pamsharpmap, but it recognizes the options
       common to all programs based on libnetpbm (See  Common Options .)

SEE ALSO

       pamsharpness(1), pammasksharpen(1), pamedge(1), pam(1), pnm(1)

HISTORY

       pamsharpmap 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/pamsharpmap.html

netpbm documentation                            07 February 2004                      Pamsharpmap User Manual(1)