NAME
ppmdither - ordered dither for color imagesSYNOPSIS
ppmditherDESCRIPTION
This program is part of Netpbm(1). ppmdither reads a Netpbm 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. It produces a PPM image as output. The default number of shades is 5 red, 9 green, and 5 blue, for a total of 225 colors. To convert the image to a binary rgb format suitable for primitive color printers, use -red=2 -green=2 -blue=2. You can do another kind of dither -- Floyd-Steinberg -- with pnmquant or pnmremap.OPTIONS
In addition to the options common to all programs based on libnetpbm (most notably -quiet, seeCommon Options ), ppmdither recognizes the following command line 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=n
- The number of red shades to be used, including black; minimum of 2. Default is 5.
- -green n
- The number of green shades to be used, including black; minimum of 2. Default is 9.
- -blue n
- The number of blue shades to be used, including black; minimum of 2. Default is 5.
SEE ALSO
pamditherbw(1), pamdepth(1), pnmquant(1), pnmremap(1), ppm(1)AUTHOR
Copyright (C) 1991 by Christos Zoulas.DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at16 December 2009 | netpbm documentation |