In fact, color is only a feeling or subjective feeling of people about the color of the reflected object. Even if it is the same object, different people see the same color, and their descriptions of this color are different.
The color difference meter is mainly a detection instrument that imitates the human eyeball's response to the three light colors of red, green and blue, and converts the color into data to express the difference in color more vividly and concretely. Regarding the use of numbers to measure color, the color space method is widely used to express color digitally. Its working principle is as follows:



1) Control of product color quality: In the actual production and application of enterprises, it is necessary to test the product color quality.
2) Auxiliary color matching of paint, spraying, ink, etc.: when the general enterprise receives the color demand of the customer, it can measure the color of the customer's sample, and then adjust the color required by the customer according to the color data.
3) Color transfer: When the Color Chart or sample is obtained from the customer, the color difference instrument is used to assist in color matching and color quality control to ensure accurate color transfer.
黄小维;朱振华;吴春明 - 《测色色差仪的应用》