chromaticity coordinates


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chromaticity coordinates

pl n
(General Physics) physics three numbers used to specify a colour, each of which is equal to one of the three tristimulus values divided by their sum. Symbols: x, y or z
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In this system, [L.sup.*] represents the lightness of color points on a 0-100 scale from black to white, [a.sup.*] is the position between red (+) and green (-), while [b.sup.*] is the position between yellow (+) and blue (-), and thus, [a.sup.*] and [b.sup.*] are chromaticity coordinates.
The chromaticity coordinates can be estimated by measuring the degree of depolarization of the polarizer and the color filter.
However, the deep red emission of these samples is almost on the end of the region of human eye color sensitivity, so the small influence of this emission on the color chromaticity coordinates of GdV[O.sub.4]:[Sm.sup.3+] is expected.
Specifically, the EyeOnWater Colour app or water transparency is based on the Forel-Ule colour index (FUI) system and converts the RGB channels of the smartphone water surface image into the xyz chromaticity coordinates which is used to index the colour of the water in terms of the FUI.
The lightness, [L.sup.*], and chromaticity coordinates ([a.sup.*] and [b.sup.*]) were measured using CM700d of Konica-Minolta Co., and the total color difference ([DELTA][E.sup.*]ab) was obtained using the following equation:
NaY[F.sub.4]:Eu micro/nanoplates exhibit orange-red color (CIE chromaticity coordinates x = 0.583, y = 0.379).
For the analysis of the parameters in CIELAB space, the chromaticity coordinates in RGB and brightness for both models was plotted with the intention to visualize possible changes in relation to inside the Annona Muricata with the pesticide Malathion, respect to the base model of the fruit without pesticide.
In these, it found a color relationship with the state of maturity and the physicochemical properties to the fruits studied by the chromaticity coordinates and image processing.
For the chromaticity coordinates [a.sup.*] and [b.sup.*], all the values were positive, evidencing a tendency to red and yellow, respectively.
The chromaticity coordinates [a.sup.*] represents the red (+[a.sup.*]) to green (-[a.sup.*]), whereas [b.sup.*] represents the yellow (+[b.sup.*]) to blue (-[b.sup.*]).
(5) The color temperature and CIE chromaticity coordinates of the coatings were measured using a MFS-630 optical characteristics measuring system (Hong Ming Technology, Taiwan).