Patent ID: 7324118

Claim:
A method of selecting an optimal color with respect to a background color using the Munsell color-order system, the Munsell color-order system being represented in a three dimensional space around an achromatic axis in a vertical direction, the vertical direction representing a predetermined lightness range of lightness levels, a horizontal direction representing a predetermined saturation range of saturation levels, a circumference around the achromatic axis representing a predetermined hue range of hue levels, comprising the steps of: selecting a first point in the Munsell color-order system as a first color; and selecting a second point in the Munsell color-order system as a second color at a predetermined relative distance from the first point, a first distance and a second distance being defined from the achromatic axis respectively to the first point and the second point, a ratio of the first distance over the second distance being equal to or more than four, wherein the second color is distinctive in combination with the first color for desired human perception.