Color is the attribute of visual perception consisting of any combination of chromatic and achromatic content. This attribute can be described by chromatic color names such as yellow, orange, brown, red, pink, green, blue, purple, etc., or by achromatic color names such as white, grey, black, etc., and qualified by bright, dim, light, dark or by combinations of such names. Perceived color depends on the spectral distribution of the color stimulus, on the size, shape, structure and surroundings of the stimulus area, on the state of adaptation of the observer’s visual system, and on the person’s experience of prevailing and similar situations of observation.

Colorimetry is the study of the dimensional relations between colors. It assumes that colors can be described by dimensional figures and that these dimensional figures can be measured. In this concrete case, color measurement is a comparison of one color with another, since colors, as sensory impressions, cannot be traced back to other physical quantities such as current or temperature. The comparative instrument used is the human eye.

The fundamental law of colorimetry states:

”The eye that is adapted to the light evaluates incoming radiation according to three mutually independent, spectrally different, linear and continuous activity functions, the individual effects combining by linear addition into an integrated, indivisible total effect known as the color stimulus specification.”

More information about Gigahertz-Optik color measurement systems can be found under:

 Additional information from our Products section: 
      Optometers: HCT-99, P-9801
      Light Detectors

 Additional information from our Tutorials section: 
      Theory
      Application

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