This enumeration specifies highlight modes that can be used to visually identify the hotspot area.

Values:

IG_ARTX_HIGHLIGHT_NONE	Do not highlight the area.
IG_ARTX_HIGHLIGHT_INVERT	Invert colors within the area.
IG_ARTX_HIGHLIGHT_OUTLINE	Draw an outline of the area.
IG_ARTX_HIGHLIGHT_PUSH	Display the area as if it were being pressed below the surface of the page.