pnmalias

   Updated: 15 March 2004
   Table Of Contents

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.

   pnmalias reads a PNM image as input, and applies anti-aliasing
to background
   and	foreground  pixels.  If the input file is a PBM, pnmalias
promots the
   output anti-aliased image to a PGM, and prints a  message  in-
forming the user
   of the change in format.

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, pn-
malias takes
   the background color to be black, and foreground color  to  be
white.

   Specify   the   color  (color)  as  described  for  the  argu-
ment of the
   ppm_parsecolor() library routine.

   Note that even when dealing with PGMs,  background  and  fore-
ground 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 pix-
els.

   -fonly says to apply anti-aliasing only to the foreground pix-
els.

   -balias  says to apply anti-aliasing to all pixels surrounding
background
   pixels.

   -falias says to apply anti-aliasing to all pixels  surrounding
foreground
   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, pnmsmooth, pnm

AUTHOR

   Copyright  (C)  1992	 by  Alberto Accomazzi,	 Smithsonian  As-
trophysical
   Observatory.
     _________________________________________________________________



Table Of Contents

     * NAME
     * SYNOPSIS
     * DESCRIPTION
     * OPTIONS
     * SEE ALSO
     * AUTHOR

UNIX/Linux commands referenced on this page:

1. as
2. file
3. pbmtext
4. pnmsmooth