complementary color system: pairs of colors that are of “opposite” hue in some color model
Achromatic Color System: Designating color perceived to have zero
saturation and therefore no hue, such as neutral grays, white, or black.
Analogous Color
System -uses colors that are adjacent to each other on the color wheel
Monochromatic Color System: all the colors (tints, tones, and shades) of
a single hue
Split-complementary Color System is a group of three colors selected from the
color wheel. It is made up of one color plus the colors on each side of its
complement. The complement of a color is the color directly opposite it on the
color wheel.