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

       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.

       -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
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