## What are the chromaticity coordinates?

Chromaticity coordinates are the best estimate of color gamut and LED suitability for a particular display since color differences will be noticeable between two neighboring modules.

How is CCT calculated?

The CCT of a light source can be determined by extending an isotemperature line from the blackbody locus out to the chromaticity coordinates of the source. For example, Point A in figure 8 represents a light source with chromaticity coordinates of (0.24, 0.59).

### What is the chromaticity of white?

The chromaticity coordinates of equal-energy white (light having an equal mixture of all wavelengths) are 0.333, 0.333. But, when a white light is specified for some application, what is generally required is one of the CIE standard illuminants.

What is chromaticity in image processing?

Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue (h) and colorfulness (s), where the latter is alternatively called saturation, chroma, intensity, or excitation purity.

## What is CIE chromaticity diagram?

The chromaticity diagram illustrates a number of interesting properties of the CIE XYZ color space: The diagram represents all of the chromaticities visible to the average person. These are shown in color and this region is called the gamut of human vision.

What is nominal CCT?

The threshold at which a color difference becomes perceptible is defined by a MacAdam ellipse. Any LED light source whose measured color point falls within one of these quadrangles is considered to have that nominal CCT.

### What is chromaticity shift?

Chromaticity shifts are usually caused by chemical changes in the materials contained in the SSL device, and these changes have a direct impact on light emission.

How do you find the coordinates of chromaticity?

From X, Y and Z, the chromaticity coordinates x, y, z can be obtained as follows: Figure 1. The CIE color-matching functions Using x, y as the coordinates, a two-dimensional chromaticity diagram (the CIE 1931 color space diagram) can be plotted as shown in Figure 2.

## How are the 1931 CIE chromaticity coordinates calculated?

The 1931 CIE (x, y) chromaticity coordinates are calculated from the spectral power distribution of the light source and the CIE color-matching functions (Figure A-1). where p is the SPD of the light source. From X, Y and Z, the chromaticity coordinates x, y, z can be obtained as follows: Figure 1. The CIE color-matching functions