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pamsharpness - measure the sharpness of a PNM/PAM image |
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pamsharpness [imagefile] |
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This program is part of Netpbm(1). pamsharpness reads a Netpbm image (PNM or PAM) and prints 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. |
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pamsharpmap(1), pammasksharpen(1), pam(1), pnm(1) |
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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. |