Oki ES3640eMFP Reference Manual page 100

A
A-100 Desktop Color Primer
Colors opposite one another on the color wheel are called
complements (see example a in the following figure), and create a
striking contrast side by side. This can be the basis for a bold
graphical design, but it is an effect you should use with discretion,
since it can be visually fatiguing. Other bold combinations to
consider are split complements—a color and the two colors
adjacent to its complement (example b)—and triads (three colors
evenly spaced on the color wheel (example c). Colors adjacent to
one another on the color wheel result in subtle harmonies.
a b c
The color wheel simplifies color relationships for the purpose of
clarity, showing only saturated or pure colors. Adding the myriad
variations of each hue to the palette (more or less saturated,
darker, or lighter) creates a wealth of possibilities. Taking a pair of
complements from the color wheel and varying the saturation and
brightness of one or both colors produces a very different result
from the pure complements. Combining a light tint of a warm
color with a darker shade of its cooler complement often gives
ES3640e MFP Color Reference Guide - 100