Using Advanced Overlay Color Mapping
Using an advanced overlay, you can map highlight colors to up to four overlay colors.
You choose one of two mapping types for the overlay graphic (chroma or grayscale),
based on how you created the overlay graphic. See
Creating Menus Using the Standard Method
Because advanced overlays can have up to four colors, you’re more likely to use them to
create the normal button states (in addition to the selected and activated states) than
you would be with a simple overlay. The following sections describe strategies you can
use for each button state.