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What do the X Y and Z in tristimulus values stand for?
For example, the tristimulus values of the emerald-green pigment are X = 22.7, Y = 39.1, and Z = 31.0. Note that x + y + z = 1; thus, if two values are known, the third can always be calculated and the z value is usually omitted. The x and y values together constitute the chromaticity of a sample.
What is a cie1931 diagram?
Chromaticity diagrams are maps of relationships between colour stimuli, not between colour perceptions.
Do all colors have a dominant wavelength?
Some colors (purples and magentas) are non-spectral, i.e. have no dominant wavelength (since the intersection of the rays hit the boundary in the flat part). But they have have a COMPLEMENTARY DOMINANT WAVELENGTH, lying on the opposite side. .
How are tristimulus values used in the CIE system?
Tristimulus values measure light intensity based on the three primary color values (RGB), typically represented by X, Y, and Z coordinates. The tristimulus values system is the foundation of color language, also referred to as the CIE color system, and is used to communicate precise color values around the world.
When was the 2° XYZ tristimulus value defined?
Tristimulus values determined based on the color matching functions , and defined in 1931 by CIE; also referred to as 2° XYZ tristimulus values. They are suitable for a viewing angle of 4° or less and are defined for reflecting objects by the following formulas:
How are tristimulus values associated with a color space?
The tristimulus values associated with a color space can be conceptualized as amounts of three primary colors in a tri-chromatic, additive color model. In some color spaces, including the LMS and XYZ spaces, the primary colors used are not real colors in the sense that they cannot be generated in any light spectrum.
How does the tristimulus system measure light intensity?
This system mirrors the color receptors in the human eye, referred to as cone cells. Tristimulus values measure light intensity based on the three primary color values (RGB), typically represented by X, Y, and Z coordinates.