How to measure the color difference of the pipe?

In modern industrial production, the color consistency of products is directly related to the quality of products and market competitiveness. Especially for products such as pipe materials, the consistency of color not only affects the appearance, but also may involve the identification and application of the product. As an accurate measuring tool, color difference meter can effectively help enterprises to ensure the consistency of product color and improve product quality. This article will introduce in detail the steps of measuring the color difference of pipe materials by using color difference meter, and discuss its importance and necessity.

一、Preparation before the test

Before making a color difference measurement, it is first necessary to ensure that the color difference meter has been calibrated and is in normal working condition. At the same time, choose a uniform and stable test environment to avoid interference of external light on the measurement results.

二、the color difference measurement of different positions of the same pipe

Select a representative pipe as the test sample.

It is critical to place the measuring probe of the colorimeter perpendicular to the pipe surface, as a tilted measurement Angle can lead to a deviation in the measurement results.

Starting from one end of the tube and along the length of the tube, a number of measuring points are evenly selected for measurement. For example, a measurement point can be selected every 10 cm.

At each measuring point, keep the color difference meter stable, press the measuring button, and record the measurement data.

三、the color difference measurement of another pipe

The other pipe is measured in the same way.

It is also necessary to ensure that the measuring probe is perpendicular to the pipe surface, and that the selection and distribution of the measuring points are consistent with the first pipe for effective comparison.

四、instrument feedback color difference and Lab value analysis

After the color difference measurement is completed, it will feedback the outstanding difference and Lab value. Color difference is usually expressed as ΔE, which reflects the overall degree of difference between two colors. The Lab value represents the brightness of the color (L), the range from green to red (a), and the range from blue to yellow (b), respectively.

By analyzing the ΔE and Lab values, the magnitude and direction of color differences can be quantified. For example, if the ΔE value is small, it means that the color difference between the two pipes is small and the color consistency is good; If the ΔE value is large, the color difference is significant. By comparing the Lab values, we can understand the specific changes of color in brightness, red green and blue yellow directions.

The measurement results of the first pipe are roughly L1 = 30, a1 = -2, b1 = -9, and the color difference ΔE value at different positions is around 0.5.

This is within the acceptable range. The measurement results for the second pipe are roughly L2 = 30, a2 = -5, b2 = -6. It is calculated that the color difference ΔE in different positions also fluctuates around 0.5, indicating that the color difference of the same pipe is small, but the color difference ΔE between different pipes reaches more than 5.

Far beyond what is acceptable. As can be seen from the specific Lab value, the second pipe is equivalent in brightness (L2 is about equal to L1), more green in the red and green direction (a2 b1).