Modern thinking is that there are four basic colors, Blue, Red, Green, and Yellow, and every other color used in paint and other decorations are variations of these four (and also black and white, which are not considered colors). So although our Color Wheel has just 12 colors, the colors vary continuously around the wheel with millions of possible shades. Furthermore, each color is associated with perception, and their use can affect the way people feel and act – so the choice of color in decorations needs to consider the nature of the area being decorated.
Hue, saturation, and brightness are aspects of color in the red, green, and blue (RGB) scheme. These terms are most often used about the color of each pixel in a cathode ray tube (CRT) display.
All possible colors are specified according to hue saturation and brightness (also called brilliance), represented in terms of the R, G, and B components. In hue, there are three types of colors: primary, secondary, and tertiary.