The Principle and Steps of Enamel Color Matching
Before understanding enamel color matching, you must first understand the LAB color mode. Hue is an algorithm for representing colors in the digital world. In the digital world, in order to represent various colors, people usually divide the color into several components. Due to the difference in the principle of color formation, the difference in the color generation method between color equipment such as monitors, projectors, and scanners that directly synthesize colors by color light and printing equipment such as printers and printing machines that rely on pigments is determined. Common color modes include RGB, CMYK and LAB modes, and the calculation method of enamel color matching is mainly based on the LAB value.
The meanings of L, a, and b are: L represents lightness, a represents the degree of change from red to green, and b represents the degree of change from yellow to blue.
The coloring principle of enamel is to use different Lab color values displayed by various enamel pigments, and rationally mix the pigments, so that the color value displayed after the ratio is consistent with the target pigment color value, and the color difference range reaches △E≤2.0.
When various pigments are used in combination, the Lab values are mutually averaged and complemented each other.
For example: after mixing a pigment with a large L value and a pigment with a small L value, the L value is basically the average of the two or more. The same is true for the ab value.
The color difference value △E is a comprehensive value representing the color space, which is obtained by the square of a plus the square of b plus the square of L, and the square root. For example: if the comparison between a and the target value is greater than 0, it means reddish. Red phase, otherwise it is called less red. The same is true for bL. From the formula of △E, we can see that we should not only look at △E, but also look at a, b, and L, because whether a, b, or L is positive or negative, the squared result They are all the same, for example: if a=-0.5 and 0.5, b, L remain unchanged, the result of calculating △E is the same, but the color of the former is not as red as the latter.
1. Determine the target pigment Lab value
Provide a sample
provide pigment
Provide color card number
2. Choose enamel pigment
Pigments with close a values are preferred
supplement b value
Adjust L value
color formula
Color calculation formula.xlsx
1. Fill in the target color value
2. Find the closest Lab value in the "All Pigment Lab Values" table. If there are three items that are close to each other, the pigment should be selected first. If not, the one with the closest a value should be preferred.
3. Determine the proportion and supplement the color value.