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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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.
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).
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.
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.
There has been concern about possible color confusion among red, orange, and yellow sign colors, especially at nighttime, since the FHWA specifications for these three colors are relatively closely spaced in the International Commission on Illumination (Commission Internationale de l'Eclairage-CIE) chromaticity diagram.