1Pamsharpness User Manual(0)                        Pamsharpness User Manual(0)
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NAME

6       pamsharpness - measure the sharpness of a PNM/PAM image
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SYNOPSIS

10       pamsharpness [imagefile]
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DESCRIPTION

14       This program is part of Netpbm(1).
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16       pamsharpness reads a Netpbm image (PNM or PAM) and prints a number that
17       tells how sharp it is.
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19       Sharpness is a measure of how suddenly (in space) colors change in  the
20       image.  pamsharpness computes the sharpness of the image as the average
21       difference in intensity between each pixel and its 8  surrounding  pix‐
22       els, in each of the color components (R, G, B).
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24       pamsharpness  does  not include the edges of the image, where there are
25       not 8 pixels surrounding a pixel, in its computation.
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27       pamsharpness assumes that the image is a PNM or PNM equivalent PAM.  If
28       it isn't, the results are not necessarily meaningful.
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SEE ALSO

32       pamsharpmap(1), pammasksharpen(1), pam(1), pnm(1)
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HISTORY

36       pamsharpness  was added to Netpbm in Release 10.21 (March 2004).  Bryan
37       Henderson derived it from the program pnmsharp by B.W. van Schooten and
38       distributed as part of the Photopnmtools package.
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42netpbm documentation           07 Februrary 2004   Pamsharpness User Manual(0)