get_colors/[1,2] get_colors(+Pixel_colors)
get_colors(+Colormapable, +Pixel_colors)
Pixel_colors is a list of Pixel-Color terms, where
Pixel is bound at
call time, and Color will be bound to a color(R,G,B) term indicating the
color of Pixel in the colormap associated with Colormapable.
Colormapable defaults to the default colormap of the default screen.