The xyY space is a cross between the CIE XYZ and its normalized chromaticity coordinates xyz, such that the luminance Y is preserved and augmented with just the required two chromaticity dimensions.
12.
In the figure above-right, the " rg " chromaticity coordinates are shown on the two axes in black, along with the gamut of the 1931 standard observer.
13.
Instead of using RGB, LogLuv uses the logarithm of the luminance and the CIELUV ( " u " , " v " ) chromaticity coordinates in order to provide a EV range of nearly 128 stops.
14.
The Military Medical Purchase Description specifies the lights in the FALANT in terms of percent luminous transmittance and 1931 CIE x, y chromaticity coordinates, calculated from Illumnant A, from spectrophotometric measurements of the glass filter components that make up the lantern.
15.
For example, the standard CIE XYZ color space projects directly to the corresponding chromaticity space specified by the two chromaticity coordinates known as " x " and " y ", making the familiar chromaticity diagram shown in the figure.
16.
Although there is generally no one-to-one correspondence between illuminants and white points, in the case of the CIE D-series standard illuminants, the spectral power distributions are mathematically derivable from the chromaticity coordinates of the corresponding white points.
17.
Judd " et al . " simply tabulated the values of certain chromaticity coordinates, corresponding to commonly used correlated color temperatures, such as 5500 K, 6500 K, and 7500 K . For other color temperatures, one could consult figures made by Kelly.
18.
In different designs there are differences in the definitions of the R, G, and B chromaticity coordinates, the reference white point, the supported gamut range, the exact gamma pre-compensation functions for deriving R', G'and B'from R, G, and B, and in the scaling and offsets to be applied during conversion from R'G'B'to Y2 CbCr.
