These matrices define the colormaps for different graphics devices
invoked by
trellis.device
.
bwps.trellis
- black-and-white postscript.
colorps.trellis
- color postscript.
iris.trellis
- Silicon Graphics Iris
The color entries are specified by
the HSB (hue-saturation-brightness color model).
The black-and-white entries specify grey levels between zero and one.