chromaticity diagram


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chromaticity diagram

n
(General Physics) physics a diagram in which values of two chromaticity coordinates are marked on a pair of rectangular axes, a point in the plane of these axes representing the chromaticity of any colour
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While conventional LED lighting technology (based on blue LEDs that use yellow phosphors) produces colors only within the straight line between B and Y in the CIE Chromaticity Diagram, Kyoceras violet LEDs with RGB phosphors can produce any color within the R-G-B triangle.
The most accurate metric to describe the color shift of a light source is #u'v'--that is, the change in u'v' coordinates on the International Commission on Illumination (CIE) 1976 (u'v') chromaticity diagram, which is the most visually uniform diagram of a light source's color.
TC 1-36 CIE Technical report, Fundamental chromaticity diagram with phsysiological axes - part 1.
The ranges of tolerable variations in color are plotted as ellipses on a CIE x/y chromaticity diagram, and can be categorized into 1-step (the human eye is unable to perceive any variation in color among devices), 2-step to 3-step (levels where color variations are difficult to perceive), and 4-step to 7-step (levels where color variations are noticeable to the human eye.
To display the results in the CIE 1931 colour space chromaticity diagram, the colour coordinates x and y can be calculated as follows:
Saturation can be defined as the ratio of the brightness of the monocolor light stimulus to that of the white light stimulus, which can be attributed to the distance between the chromaticity point of the color and the one of non-chromatic stimulus point in the chromaticity diagram (JING & HU, 2006).
CIELUV chromaticity diagram has elongated the blue-red portion of the diagram and relocated white point to decrease the visual disparity with the green portion.
Colours can be matched to the CIE 1931 xyY Chromaticity Diagram.
The first chapter is devoted to fundamentals of light-emitting diodes, the perception of vision by the human eye, methods used in conjunction with the chromaticity diagram, and associated international standards in terms of color temperatures and color rendering index.
Chromaticity diagram, Commission Internationale de l'Eclairage (CIE): A two-dimensional graph that describes a color as the locus of chromaticity coordinates on a field of monochromatic light varying from 380 to 780 nm in wavelength.
To achieve this goal we "translated" the results obtained by other authors' from the nomenclature corresponding to the specific atlas employed to a CIE "common language": the language of the CIE L*u*v* space and its chromaticity diagram (CIE u'v').
On a chromaticity diagram, the straight line connecting the extreme spectral colors red and violet) is known as the line of purples (or purple boundarylessness); it represents one limit of human color perception (http://en.