What is the CIE color measurement system? What is it made up of?
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People's recognition of color is done by light, objects that reflect light, the eyes of the observer, and the brain. Color is the feeling that light falls on the retina of the human eye. Through the triggering of light, the receiver's eyes sense a large amount of three-color light, and send the electrical signal to the human brain to produce a color feeling. Light that falls into the human eye is produced by sampling the reflection of light at each wavelength, and those illumination sources flash above it. Although different wavelengths of light will cause different color sensations, in fact, all colors are a mixture of three basic colors of red (R) green (G) blue (B). When the three receivers are at different peaks at different wavelengths (one in the short wave, one in the middle wave, and one in the long wave), this means that any color can be reproduced with three dyes, pigments or color stimuli. As long as their peaks absorb or emit wavelengths can also be separated. It also means that colors can match the spectral components of different colors. This phenomenon is called metamerism. The traditional measurement of color (whether color or print) is measured with the specific RGB light quantity matched to it. Based on experience, observers are required to match the various colors with the three-color light of the mixing station. The CIE defines the average of these observers as a "standard observer" to observe a specific set of "lights". They then define a system of measurement units and measurement steps so that any color can be determined based on the specified three standard amounts of light. These are the CIE XYZ values.