colorimeter
What is the purpose of the colorimeter?
Colorimeters (also known as color difference meters, colorimeters) are equipment designed for measurement of color differences that are based on the principle of spectroscopy.
Users can measure the color value of the sample. A sample color can be compared with a standard color sample to identify its position in the color space, and the difference between the sample and the standard color sample can be determined.
Colorimeters are widely used in the metal, ceramic, plastic, coating, textile, printing, and chemical industries. At present, the CIE Lab color space is the most commonly used color space in the industry, as shown in Figure (1).
According to the CIE Lab color space, L value represents color brightness (the larger the L value, the brighter the color), a represents green-red value, and b represents blue-yellow value, as shown in Figure (2).
When comparing two samples of different colors, the difference between them can be determined by the lab difference measured by the color difference meter rather than the lab values for each sample Differentiation.
As an example, the Lab value of the standard color sample provided by the customer is 55/6/7, whereas the Lab value of our actual finished product is 58/7/8. The color difference between the finished product and the standard color sample can be distinguished by the eye if it is greater than 2.
The color state of the finished product can be determined by comparing the two sets of Lab values. It is therefore possible to determine qualified or unqualified products during quality control by setting an allowable range value in advance.