Pnmalias User Manual(1) General Commands Manual Pnmalias User Manual(1)
NAME
pnmalias - antialias a PNM image
SYNOPSIS
pnmalias
[-bgcolor color]
[-fgcolor color]
[-bonly]
[-fonly]
[-balias]
[-falias]
[-weight w]
[pnmfile]
DESCRIPTION
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
promotes the output anti-aliased image to a PGM, and prints a message
informing the user of the change in format.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), pnmalias recognizes the
following command line options:
-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
white.
Specify the color (color) as described for the argument of the
pnm_parsecolor() library routine ⟨libnetpbm_image.html#colorname⟩ .
Note that even when dealing with PGMs, background and foreground colors
need to be specified in the fashion described above. In this case, pn-
malias 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-
ground pixels.
-falias says to apply anti-aliasing to all pixels surrounding fore-
ground pixels.
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.
SEE ALSO
pbmtext(1), pnmsmooth(1), pnm(1)
AUTHOR
Copyright (C) 1992 by Alberto Accomazzi, Smithsonian Astrophysical Ob-
servatory.
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/pnmalias.html
netpbm documentation 15 March 2004 Pnmalias User Manual(1)
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