pgmnoise(1) General Commands Manual pgmnoise(1)NAME
pgmnoise - create a graymap made up of white noise
SYNOPSIS
pgmnoise width height
DESCRIPTION
Creates a portable graymap that is made up of random pixels with gray values in the range of 0 to PGM_MAXMAXVAL (depends on the compila-
tion, either 255 or 65535). The graymap has a size of width * height pixels.
SEE ALSO pgm(5)AUTHOR
Copyright (C) 1993 by Frank Neumann
16 November 1993 pgmnoise(1)
Check Out this Related Man Page
pbmtopgm(1) General Commands Manual pbmtopgm(1)NAME
pbmtopgm - convert portable bitmap to portable graymap by averaging areas
SYNOPSIS
pbmtopgm width height [pbmfile]
DESCRIPTION
pbmtopgm reads a portable bitmap as input. It outputs a portable graymap in which each pixel's gray level is the average the surrounding
black and white input pixels. The surrounding area is a rectangle of width by height pixels.
In other words, this is a convolution. pbmtopgm is similar to a special case of pnmconvol.
You may need a ppmsmooth step after pbmtopgm.
pbmtopgm has the effect of anti-aliasing bitmaps which contain distinct line features.
pbmtopgm works best with odd sample width and heights.
You don't need pbmtopgm just to use a PGM program on a PBM image. Any PGM program (assuming it uses the Netpbm libraries to read the PGM
input) takes PBM input as if it were PGM, with only the mininum and maximum gray levels. So unless your convolution rectangle is bigger
than one pixel, you're not gaining anything with a pbmtopgm step.
SEE ALSOnetpbm(1), pgmtopbm(1), pbm(5)AUTHOR
Copyright (C) 1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.
Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro-
vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup-
porting documentation. This software is provided "as is" without express or implied warranty.
03 Sep 2001 pbmtopgm(1)
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