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-alias-
       ing  to  background  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 inform-
       ing the user of the change in format.

OPTIONS
       -bgcolor colorb, -fgcolor colorf
              set the background color to colorb, and  the  fore-
              ground  to color to colorf.  Pixels with these val-
              ues will be anti-aliased.  by  default,  the  back-
              ground  color  is taken to be black, and foreground
              color is assumed to be white.  The  colors  can  be
              specified 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 hex-
                   adecimal 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 num-
                   bers separated by commas: r,g,b, where r g and
                   b are floating point numbers between 0 and  1.
                   (This  style was added before MIT came up with
                   the similar rgbi style.)

              Note that even when dealing  with  graymaps,  back-
              ground  and  foreground 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 back-
              ground  (-balias),  or foreground (-falias) pixels.
              By default, anti-aliasing takes  place  only  among
              neighboring background and foreground pixels.

       -weight w
              Use  w  as the central weight for the aliasing fil-
              ter.  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                         1