People’s perception of color is influenced by their subjective consciousness. Even when looking at the same object, people will express the same color in different words according to different standards and experiences. Therefore, expressing color in words is complex and difficult. However, a colorimeter is an instrument that dates color. Color differences are expressed through data.
A digital colorimeter is an optical measurement instrument that simulates the human eye’s sensing of red, green and blue light. However, how to use a color meter to data the color? Color is composed of three attributes: hue, luminance, and color saturation. By creating hue, brightness, and saturation scales, we can measure color digitally. The color space method is now used worldwide for the digital representation of the color.
The colorimeter can measure and display the color difference ∆E and ∆a, ∆b, ∆L values between the specimen and the standard according to the Lab principle of CIE color space. ∆E*ab is defined as the total color difference of the sample, but it does not indicate the direction of offset of the color difference of the specimen. The larger the value of ∆E*ab, the more significant the color difference. The size of ∆E*ab value depends on the requirements of different companies. In general, ∆E*ab greater than 1 can distinguish the color difference to the human eye.