red dither for color images

<DT><B><a href="pamditherbw.html">pamditherbw</a>     </B>
<DD>dither a grayscale image to black and white (convert PGM to PBM)

<DT><B><a href="pnmcolormap.html">pnmcolormap</a></B>
<DD>Choose the N best colors to represent an image; create a colormap

<DT><B><a href="pnmremap.html">pnmremap</a></B>
<DD>Replace colors in an image with those from a color map

<DT><B><a href="ppmquant.html">ppmquant</a>      </B>
<DD>quantize colors in a color image down to fewer colors - obsolet