Color Wheel-A color circle, based on red, yellow and blue, is traditional in the field of art.  In reality, any color circle or color wheel which presents a logically arranged sequence of pure hues has merit. There are also categories of colors based on the color wheel. There is a 3 type color wheel which consists of Primary Colors, Secondary Colors, and Tertiary Colors.  The Primary Colors consists red, yellow and blue which are the 3 pigment colors that can not be mixed or formed by any combination of other colors. All other colors are derived from these 3 hues. The Secondary Colors all derive from the primary colors: for example red mixes with blue to create purple. And the Tertiary colors are formed by mixing a primary and a secondary color like red-orange.

Color Harmonies-  Color harmony is something that is pleasing to the eye. It engages the viewer and it creates an inner sense of order, a balance in the visual experience. When something is not harmonious, it’s either boring or chaotic. The human brain will reject under-stimulating information. At the other extreme is a visual experience that is so overdone, so chaotic that the viewer can’t stand to look at it. The human brain rejects what it can not organize, what it can not understand. Color harmony delivers visual interest and a sense of order. Color Harmony is created experimentally not mathematically.

Additive and Subtractive color- Additive and Subtractive colorare how colors mix together. Additive color is RGB and ends with CYMK; Additive color systems start with darkness and end with lightness. Conversely subtractive colors  is CMYK and ends RGB: Subtractive colors start with light colors and end with darkness.

Hue, Value, Saturation- Hue, Value, Saturations ( HVS).  Hue is the specific color used from the color wheel. Value describes the amount of that color, or color strength that is displayed. Saturation is the amount of hue or a hue’s dominance in the final color. Together these factors make a color.

http://www.colormatters.com/color-and-design/basic-color-theory

http://en.wikipedia.org/wiki/Subtractive_color

http://en.wikipedia.org/wiki/Additive_color

http://www.ncsu.edu/scivis/lessons/colormodels/color_models2.html