Small lighting knowledge | color can be measured? - China lighting network

The human eye observation objects, in addition to feel the object form, far or near, light and shade, also feel the color of the object. Initially, people just for perceived to come up with a name each color red, white, yellow and so on, so that the difference between each other. And our eyes can distinguish the color of the tens of thousands of species, represented by name of all the colors obviously doesn't work, is not accurate. With the progress of science and technology, people gradually realized that our perceived color is actually outside light stimulate visual organs generated a physiological effect. The effect of information by the central processing and color perception. As a result, color measuring principle is different from pure physical quantity measurement, has its own characteristics. In addition to consider the cause of color vision of the strength of the radiation and its spectral, consider the visual organs physiological characteristics and law of color vision. The quantitative measurement of the color colorimetry is the study of a subject. Experiments show that any one color available special selected three kinds of monochromatic light wave produced by certain proportion mixing. Now commonly used is red, green and blue three monochromatic light, this is what people often say that the three primary colors. By the human eye observation, with three primary colors take different proportions can match the colour area visible light of different wavelengths. Therefore, the color of each wavelength of light is the ratio of corresponding to a set of three primary colors, thus get the human color vision function. Experimental results of the international commission on illumination scientists are summarized, unified the color function value, it shows the average human color vision characteristics. So you can according to the spectrum of light ( Whether the light source, or an object of reflection and transmission) The calculation of color tristimulus values and chromaticity coordinates. So any one color can be used to represent its chromaticity coordinates, so as to realize the measurement of the color. CIE standard colorimetric system is set up for this kind of method to regulate color representation and measurement. This is a kind of mixed color system, is by psychophysics method and measurement of color. Another kind of method is based on the perceived color three attributes of hue, lightness and saturation, they can be divided into several classes, make standard color sample, and arranged according to certain rule. Every piece of color sample is given a grade, will be measured by the color of the sample and standard color do visual comparison, find out the same as the measured color color sample, the label of the color sample is measured color label, also is the measured value of the measured color. There are several kinds of, this kind of measurement method is one of the most famous and the most widely used is the munsell color system. Different colors of light can produce different psychological and physiological effect. In lighting engineering, therefore, should not only focus on lighting 'number', but also pay attention to the color of the light source and the composition of the spectrum. YanZhiXiang

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