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 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 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 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 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 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, background 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 background (-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 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)