pnmalias(1)                                                   General Commands Manual                                                  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 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)