Colors presents a grid showing the colors in the RGBV color map
Clicking mouse button 1 over a color in the grid will display the map index for that color,
red, green, and blue components,
and the 32-bit hexadecimal color value as defined in
-x option is specified, the components will also be listed in hexadecimal.
-r option instead shows, in the same form, a grey-scale ramp.
A menu on mouse button 3 contains a single entry, to exit the program.
Cmapcube presents the same colors but in a 3-dimensional cube.
Dragging with button 1 rotates the cube.
Clicking on a color with button 2
displays the map index for that color.
Clicking button 3 exits.
-n option disables drawing of the color squares.
-w options set the background (default grey)
to black or white.