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Pnmalias User Manual(0)                                Pnmalias User Manual(0)



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
       -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 ppm_parsecolor() library routine .

       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.



netpbm documentation             15 March 2004         Pnmalias User Manual(0)