get_color/[2,3] get_color(+Pixel, -Color)
get_color(+Colormap, +Pixel, -Color)
Color is the color of Pixel in the colormap associated with
Colormapable. Color is specified as a
color(R,G,B) term, and Pixel must be an integer.
Colormapable defaults to the default colormap of the default screen.