1. The customer provided the manufacturer with a set of color coordinates, but did not provide standard samples
In this case, be sure to find out where the color coordinates provided by the customer are
Color space measurement, as well as lighting conditions, light source types, and different color coordinate spaces, the measured values vary greatly and are not comparable.
Under the same color space, the lighting conditions are different, and the chromaticity coordinates are relatively different, but the color difference is relatively small.
Suggestion: Ask the customer to provide a standard sample, use the standard sample to communicate with the user, use the standard sample as a reference, and control the color difference.
2. The examples above are all the standard spaces of CIE1976. ADCI-60-C series provides a variety of color coordinate spaces, and the color coordinate space of the current instrument must be determined according to the user’s color coordinate space.
3. All instruments, including spectroscopic Colorimeters, use a standard whiteboard as a benchmark to adjust the instrument. After the instrument has been used for a period of time, it must be recalibrated with the standard whiteboard that comes with it to achieve higher measurement accuracy. .
Debugging of Colorimeter
First: the measurement of color matching
When the user gets a sample, it needs to reproduce the same color as the sample. At this time, the sample needs to be repeatedly proofed. In the past, the difference between the small sample and the standard sample was compared by human eyes. When it is within the allowable range, Hand over the process to the workshop for production. Due to the subjective factors of the human eye, this difference is difficult to determine. At this time, a Colorimeter can be used to measure the difference between the small sample and the standard sample, and determine whether the color difference of the sample meets the range according to the difference. In this way Can reduce the uncertainty of human eye observation
The biggest advantage of using a Colorimeter to participate in color matching is that it can correct the formula according to the data provided by the Colorimeter and refer to the chromaticity diagram, and can complete the task of color matching faster and more accurately. Here is an example
If the color coordinates of the standard sample are
L*=74.40, a*=1.67, b*=23.80
Use the <Standard> setting function of ADCI-60-C to set the measured value of the standard sample as the standard (refer to the manual of ADCI-60-C for specific operations), and then measure the small sample to get the result of the small sample.
L*=74.39, a*=0.67, b*=20.30; dL*=0.01, da*=1.0, db*=1.50
Refer to the color coordinate chart below
It can be seen that when modifying the sample formula next time, add green (or reduce red), add blue (or reduce yellow), and you can determine the degree of addition according to the test results, and repeat it several times until the color difference is within the allowable range Inside, experienced users can basically determine the proportion of the formula between 2-3 times according to the value of the Colorimeter.
Second: the role of Colorimeter in quality control
After the formula is determined, it is put into production. Due to the changes of many factors in the production, the batch of products may have color deviation. In this way, it is necessary to measure the color deviation with a color difference meter in production to adjust the production process to achieve the consistency of product color. sex.
Third: In terms of mass transmission
Customers now generally provide Color Charts or samples, so when signing a contract with the user, try to save the actual object as a standard.
No matter how high-end instruments are, there are deviations according to the actual environment. The national color benchmarks are based on standard white boards and swatches, not instruments. ADCI-60-C series instruments are all measured by the Chinese Academy of Metrology Calibration of the instrument with a standard white board.
