NAME

       pnmalias - antialias a PNM image

SYNOPSIS

       pnmalias

       [-bgcolor color]

       [-fgcolor color]

       [-bonly]

       [-fonly]

       [-balias]

       [-falias]

       [-weight w]

       [pnmfile]

DESCRIPTION

       This program is part of Netpbm(1).

       pnmalias  reads  a  PNM  image  as  input,  and  applies  anti-aliasing  to background and
       foreground pixels.  If the input file is a PBM, pnmalias promotes the output  anti-aliased
       image to a PGM, and prints a message informing the user of the change in format.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common Options ⟨index.html#commonoptions⟩ ), pnmalias recognizes  the  following  command
       line options:

       -bgcolor colorb sets the background color the colorb.

       -fgcolor colorf sets the foreground color to colorf.

       Pixels  with these values will be anti-aliased.  By default, pnmalias takes the background
       color to be black, and foreground color to be white.

       Specify the color (color) as described for the argument of  the  pnm_parsecolor()  library
       routine ⟨libnetpbm_image.html#colorname⟩ .

       Note  that  even  when  dealing  with  PGMs,  background  and foreground colors need to be
       specified in the fashion described above.  In this case, pnmalias takes the background and
       foreground pixel values to be the value of the red component for the specified color.

       -bonly says to apply anti-aliasing only to the background pixels.

       -fonly says to apply anti-aliasing only to the foreground pixels.

       -balias says to apply anti-aliasing to all pixels surrounding background pixels.

       -falias says to apply anti-aliasing to all pixels surrounding foreground pixels.

       If  you  specify  neither  -balias  nor -falias, pnmalias applies anti-aliasing only among
       neighboring background and foreground pixels.

       -weight w says to 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(1)

AUTHOR

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

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/pnmalias.html