Still maximal hue difference: purple and its complement, yellow-green.

Maximal luminosity difference: with the natural luminosity difference inverted: light purple instead of dark; and dark yellow-green (black added) instead of the naturally light yellow-green of the first two variations.

Medial intensity difference, with the intensities inverted: this time the yellow-green is made low-intensity by adding twice as much black, and the purple is made moderate-intensity by adding half the amount of white.

William Tapley
Art of Color
Color Descriptions of
Sets   Paintings