pnmalias



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 back-
       ground and foreground pixels.  If the input file  is  a  PBM,  pnmalias
       promots  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_par-
       secolor() 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  back-
       ground pixels.

       -falias  says  to  apply  anti-aliasing to all pixels surrounding fore-
       ground 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)

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