Maximal hue difference: Dioxazine purple and its complement, yellow green (a mixture of cadmium yellow light and thalo green).

Maximal luminosity difference: The yellow-green is naturally light, the purple naturally dark.

Moderate intensity difference: fully intense yellow green (no white or black added to a mixture of cadmium yellow light and thalo green) on a purple background made moderate-intensity by adding very dark gray to purple.