ABSTRACT

The basic principles on how humans perceive color have been described in Section 1.1. To combine the sensory perceptions of man with physical results has been the objective of numerous scientists.

The mathematical tricks that were necessary to combine color TV and color measurement, have been used in normal analytical practice as well as in a specific colorimetric dictionary. The International Commission on Lighting (CIE: Commission International de I 'Eclairage) has developed a system that is based on experience that any color can be created by the additive blending of three primary colors: red, green and violet (principle of color TV). As the colors of an object depend on the spectral composition of light which is used, eIE has established four standard types of light that are used in color determination:

Standard light type A is used when lighting conditions are required which simulate a normal light bulb

Standard light type B corresponds direct sunlight Standard light type C corresponds to average daylight Standard light type D65 contains the normal UV percentage of daylight

It is self-evident that the used standard light type as well as the visual area of the observer are indicated in the test results.