special ColorFunction

*To*: mathgroup at smc.vnet.net*Subject*: [mg5766] special ColorFunction*From*: rustybel at foothill.net (Russell Towle)*Date*: Sat, 18 Jan 1997 14:58:24 -0500*Sender*: owner-wri-mathgroup at wolfram.com

Hi, I wish to construct a special ColorFunction for use in DensityPlots. The object is to assign an RGB color to each cell in such a way that the (normalized) magnitude of the cell is divided into red and green components. First, the red component would be the greatest multiple of 1/256 below the actual normalized magnitude; and then, the green component would be 1/256 of whatever is left over from this greatest multiple of 1/256. The blue part of the RGB would just be zero. The object is to use the MMA DensityPlot to contruct a matrix of 16-bit "numbers," 8 bits to red, 8 bits to green. This can then be used in POV-Ray as a height field. I would very greatly appreciate any suggestions. An example of such a special ColorFunction is as follows: ColorFunction -> (GrayLevel[#^3]&). TIA, Russell Towle Giant Gap Press: books on California history, digital topographic maps P.O. Box 141 Dutch Flat, California 95714 ------------------------------ Voice: (916) 389-2872 e-mail: rustybel at foothill.net ------------------------------