Xerox Phaser EX7750 Reference Guide

A color wheel like the one in the following figure is a helpful tool for understanding 
the interrelation of colors. The colors on one side of the color wheel, from magenta to 
yellow, appear to most people to be warm colors, while those on the other side, from 
green to blue, appear to be cool. The distance between two colors on the color wheel 
can help predict how they will appear when seen side by side.

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.