Generates a 256-color image color matrix from the colors specified
in its arguments.
USAGE:
java.colorscheme.image.generate(...)
OPTIONAL ARGUMENTS:
...
one or more of the following: (1) integer vector of length three specifying
red, green, and blue values for a single color, (2) character string specifying
one of a known set of colors (red, greed, blue, yellow, magenta, cyan, black,
white), or (3) a single integer giving a number of intermediate colors between
two other colors. For example,
java.colorscheme.image.generate("blue", 4, "green")
creates an image color matrix using six colors from blue to green.
VALUE:
a numeric matrix with 3 columns and 256 rows. Each row specifies a color.