CentOS 7.0 - man page for pamsharpmap (centos section 0)
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Pamsharpmap User Manual(0) Pamsharpmap User Manual(0)
pamsharpmap - create map of sharpness in a PNM/PAM image
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 max-
pamsharpness(1) , pammasksharpen(1) , pamedge(1) , pam(1) , pnm(1)
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 Photopnm-
netpbm documentation 07 February 2004 Pamsharpmap User Manual(0)
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