Provided by: netpbm_10.0-15ubuntu2_amd64
pnmsmooth - smooth out an image
pnmsmooth [-size width height] [-dump dumpfile] [pnmfile]
Smooths out an image by replacing each pixel with the average of its width X height neighbors. It is implemented as a C progam that generates a PGM convolution matrix and then invokes pnmconvol.
-size width height Specifies the size of the convolution matrix. Default size is a 3x3 matrix. Width and height sizes must be odd. Maximum size of convolution matrix is limited by the maximum value for a pixel such that (width * height * 2) must not exceed the maximum pixel value. -dump dumpfile Generates and saves the convolution file only. Use of this option does not invoke pnmconvol.
Copyright (C) 1989, 1991 by Jef Poskanzer. Converted from script to C program December 1994 by Mike Burns (firstname.lastname@example.org). 4 December 1994 pnmsmooth(1)