Pnmalias User Manual(0) Pnmalias User Manual(0)
pnmalias - antialias a PNM image
This program is part of Netpbm(1).
pnmalias reads a PNM image as input, and applies anti-aliasing to back-
ground and foreground pixels. If the input file is a PBM, pnmalias
promots the output anti-aliased image to a PGM, and prints a message
informing the user of the change in format.
-bgcolor colorb sets the background color the colorb.
-fgcolor colorf sets the foreground color to colorf.
Pixels with these values will be anti-aliased. By default, pnmalias
takes the background color to be black, and foreground color to be
Specify the color (color) as described for the argument of the ppm_par-
secolor() library routine .
Note that even when dealing with PGMs, background and foreground colors
need to be specified in the fashion described above. In this case,
pnmalias takes the background and foreground pixel values to be the
value of the red component for the specified color.
-bonly says to apply anti-aliasing only to the background pixels.
-fonly says to apply anti-aliasing only to the foreground pixels.
-balias says to apply anti-aliasing to all pixels surrounding back-
-falias says to apply anti-aliasing to all pixels surrounding fore-
If you specify neither -balias nor -falias, pnmalias applies anti-
aliasing only among neighboring background and foreground pixels.
-weight w says to use w as the central weight for the aliasing filter.
w must be a real number in the range 0 < w < 1. The lower the value of
w is, the ’blurrier’ the output image is. The default is w = 1/3.
pbmtext(1), pnmsmooth(1), pnm(1)
Copyright (C) 1992 by Alberto Accomazzi, Smithsonian Astrophysical
netpbm documentation 15 March 2004 Pnmalias User Manual(0)
Man(1) output converted with