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pnmalias(1)							   pnmalias(1)

NAME
       pnmalias - antialias a portable anyumap.

SYNOPSIS
       pnmalias	 [-bgcolor color] [-fgcolor color] [-bonly] [-fonly] [-balias]
       [-falias] [-weight w] [pnmfile]

DESCRIPTION
       Reads a portable anymap as input, and applies  anti-aliasing  to	 back‐
       ground  and foreground pixels.  If the input file is a portable bitmap,
       the output anti-aliased image is promoted to a graymap, and  a  message
       is printed informing the user of the change in format.

OPTIONS
       -bgcolor colorb, -fgcolor colorf
	      set  the background color to colorb, and the foreground to color
	      to colorf.  Pixels with these values will	 be  anti-aliased.  by
	      default,	the  background	 color is taken to be black, and fore‐
	      ground color is assumed to be white.  The colors can  be	speci‐
	      fied in five ways:

	      o	   A name, assuming that a pointer to an X11-style color names
		   file was compiled in.

	      o	   An X11-style hexadecimal specifier: rgb:r/g/b,  where  r  g
		   and b are each 1- to 4-digit hexadecimal numbers.

	      o	   An X11-style decimal specifier: rgbi:r/g/b, where r g and b
		   are floating point numbers between 0 and 1.

	      o	   For backwards compatibility, an  old-X11-style  hexadecimal
		   number: #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.

	      o	   For backwards compatibility, a triplet of numbers separated
		   by commas: r,g,b, where r g and b are floating  point  num‐
		   bers	 between  0  and  1.  (This style was added before MIT
		   came up with the similar rgbi style.)

	      Note that even when dealing with graymaps, background and	 fore‐
	      ground  colors  need  to	be  specified in the fashion described
	      above.  In this case, background and foreground pixel values are
	      taken to be the value of the red component for the given color.

       -bonly, -fonly
	      Apply  anti-aliasing  only to background (-bonly), or foreground
	      (-fonly) pixels.

       -balias, -falias
	      Apply  anti-aliasing  to	all  pixels   surrounding   background
	      (-balias),  or  foreground  (-falias) pixels.  By default, anti-
	      aliasing takes place only among neighboring background and fore‐
	      ground pixels.

       -weight w
	      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(5)

AUTHOR
       Copyright  (C)  1992  by	 Alberto  Accomazzi, Smithsonian Astrophysical
       Observatory.

				 30 April 1992			   pnmalias(1)
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