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An illuminant is characterized by its relative spectral power distribution (SPD). The white point of an illuminant is the chromaticity of a white object under the illuminant, and can be specified by chromaticity coordinates, such as the x, y coordinates on the CIE 1931 chromaticity diagram (hence the use of the relative SPD and not the absolute SPD, because the white point is only related to ...
The spectrum of a standard illuminant, like any other profile of light, can be converted into tristimulus values. The set of three tristimulus coordinates of an illuminant is called a white point. If the profile is normalized, then the white point can equivalently be expressed as a pair of chromaticity coordinates.
The white point is generally defined as—or assumed to be—equal energy white (illuminant E). This is defined as [x, y] = (1/3, 1/3) in CIE xyY , and as [X, Y, Z] = (1, 1, 1) in XYZ color space . However, other white points may be used, generally defined by "white" standard illuminants or a color temperature such as 6500 K (D65).
For example, the white point of an sRGB display is an x, y chromaticity of (0.3127, 0.3290), where x and y coordinates are used in the xyY space. (u′, v′), the chromaticity in CIELUV, is a fairly perceptually uniform presentation of the chromaticity as (another than in CIE 1931) planar Euclidean shape.
The color swatches represent the color of each white point, ... light white fluorescent F7 0.31292: 0.32933 0.31569: 0.32960 6500 D65 simulator, daylight simulator F8
Nov. 16—For years, it was an iconic holiday fixture in Pittsburgh. The Point State Park Christmas tree dotted the city's confluence as an annual beacon of the season. Until last year. Sponsored ...