This Demonstration shows a palette of five, six, or seven colors based on your choice for a starting color from the displayed color wheel and a color scheme (monochrome, analogous, complementary, split complementary, triadic, or tetradic).
Color schemes are based on the principles of color theory. Colors are produced in hue, saturation, brightness (HSB), so that the hue is cyclical, allowing for simpler palette functions.
More information on color theory can be found in .
 Tiger Color. "Basic Color Schemes." (Jul 22, 2014) www.tigercolor.com/color-lab/color-theory/color-theory-intro.htm.