chromaticity coordinates


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chromaticity coordinates

[‚krō·mə′tis·əd·ē kō′ȯrd·ən‚āts]
(optics)
The fractional amounts of the x, y, and z primary colors, specified by the International Committee on Illumination, in a color sample; more precisely, x = X /(X + Y + Z), y = Y /(X + Y + Z), z = Z /(X + Y + Z), where X, Y, and Z are the integrals over wavelength λ of the product of the amount of light emerging from the sample per unit wavelength, and the tristimulus values, (λ), (λ), and (λ), respectively.
References in periodicals archive ?
The fact that the stimuli appeared different in color illustrates another error in using CCT as a correlate for brightness perception: two lamps with the same CCT can have not only different chromaticity coordinates but also a very different appearance.
The bowtie effect demonstrated by Thornton [1992a] indicates that stimuli with primaries near 480-500 nm (called the "anti-prime" region) will have the largest difference between chromaticity coordinates and appearance.
It is notable that the area of greatest difference between chromaticity coordinates and perceived color is in the 480 -500 and 580 nm regions.
The 3500K device has chromaticity coordinates of Cx 0.
The chromaticity coordinates of the different LEDs were a strong function of drive current, as shown in Fig.
The values of lightness and chromaticity coordinates before and after weathering tests were used to calculate the discoloration ([DELTA][E.
New TAOS Digital Color Light Sensors Provide a Means for Deriving Color Temperature and Chromaticity Coordinates to Manage LCD Display Backlighting
The x and y chromaticity coordinates of the two sources studied can be determined from the stated source color temperatures and are approximately 0.
Each room was calibrated for chromaticity coordinates and luminance in advance of the experimental sessions.