ppmdither



Ppmdither User Manual(0)                              Ppmdither User Manual(0)




NAME

       ppmdither - ordered dither for color images



SYNOPSIS

       ppmdither

       [-dim power]

       [-red shades]

       [-green shades]

       [-blue shades]

       [ppmfile]



DESCRIPTION

       This program is part of Netpbm(1).

       ppmdither  reads  a  PPM image as input, and applies dithering to it to
       reduce the number of colors used down to the specified number of shades
       for  each  primary.   The  default  number 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, including 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), pnmquant(1), ppm(1)



AUTHOR

       Copyright (C) 1991 by Christos Zoulas.



netpbm documentation             14 July 1991         Ppmdither User Manual(0)

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