![]() ![]() Therefore, a different coefficient is set for each illumination spectral distribution. We are familiar with a change in color when the illumination is changed. However, the spectral reflectance is used in the explanations below.) To explain in more detail, in the JIS standard, the spectral distribution of the illumination and colormatching function are calculated using multiple conditions. ![]() (If the light passes through the object, the spectral transmittance can be used for the calculation. As the spectral distribution of the illumination and the spectral sensitivity characteristics (color-matching function) of the eye are defined in the JIS standards, a color value can be calculated if the spectral reflection of the object is known. Color measurements are related to illumination, spectral characteristics of the object, and the spectral sensitivity characteristics of the human eye. Color measurements are a method of expressing the colors sensed by humans as values. In practice, the simple proportion of light collected undergoes various processing as it passes along the nerves before being recognized by the person as color. The proportion of light collected by these cells is sent to the brain and sensed as color. When a person views an object, light from a light source that is reflected from the object (or passes through the object) enters the eye and is collected by several types of photoreceptor cells in the retina. ![]()
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