ppmdither

 

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 ppmdither(1)                                         ppmdither(1)
 
 
 
NAME
        ppmdither - ordered dither for color images
 
SYNOPSIS
        ppmdither  [-dim  power]  [-red  shades]  [-green  shades]
        [-blue shades] [ppmfile]
 
DESCRIPTION
        Reads a portable pixmap as input, and applies dithering to
        it  to reduce the number of colors used down to the speci­
        fied number of shades for each primary.  The default  num­
        ber  of  shades  is red=5, green=9, blue=5, for a total of
        225 colors.  To convert the image to a binary  rgb  format
        suitable  for color printers, use -red 2 -green 2 -blue 2.
 
 
OPTIONS
        -dim power    The  size  of  the  dithering  matrix.   The
                      dithering matrix is a square whose dimension
                      is a power of 2.  power is that power of  2.
                      The default is 4, for a 16 by 16 matrix.
 
        -red shades   The number of red shades to be used, includ­
                      ing black; minimum of 2.
 
        -green shades The number  of  green  shades  to  be  used,
                      including black; minimum of 2.
 
        -blue shades  The  number  of  blue  shades  to  be  used,
                      including black; minimum of 2.
 
SEE ALSO
        pnmdepth(1), ppmquant(1), ppm(5)
 
AUTHOR
        Copyright (C) 1991 by Christos Zoulas.
 
 
 
                            14 July 1991              ppmdither(1)

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