Developer Reference

  • 2020
  • 10/21/2020
  • Public Content
Contents

CIE Chromaticity Diagram and Color Gamut

Figure
CIE
xyY
Chromaticity Diagram and Color Gamut
presents a diagram of all visible colors. It was developed as a result of the experimental investigations performed by CIE (International Commission on Illumination, http://members.eunet.at/cie). The diagram presents visible colors as a function of
x
(red) and
y
(green) components called chromaticity coordinates. Positions of various spectrum colors (from violet to red) are indicated as the points of a tongue-shaped curve called spectrum locus. The straight line connecting the ends of the curve is called the purple line. The point of equal energy represents the CIE standard for white light. Any point within the diagram represents some mixture of spectrum colors. The pure or fully saturated colors lie on the spectrum locus. A straight-line segment joining any two points in the diagram defines all color variations that can be obtained by additively combining these two colors. A triangle with vertices at any three points determine the gamut of colors that can be obtained by combining corresponding three colors.
The structure of the human eye that distinguishes three different stimuli, establishes the three-dimensional nature of color. The color may be described with a set of three parameters called tristimulus values, or components. These values may, for example, be dominant wavelength, purity, and luminance, or so-called primary colors: red, green, and blue.
The chromaticity diagram exhibits that the gamut of any three fixed colors cannot enclose all visible colors. For example, Figure
CIE
xyY
Chromaticity Diagram and Color Gamut
shows schematically the gamut of reproducible colors for the RGB primaries of a typical color CRT monitor, CMYK color printing, and for the NTSC television.
CIE
xyY
Chromaticity Diagram and Color Gamut

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804