Study on color stability under different light sources based on color difference analysis

Product color is an important indicator to measure product quality. Since the change of the light sources in the product circulation environment cannot be avoided, the color of the product will be affected by the change of the light sources undoubtedly. Therefore, it is of practical significance to study the color stability under different light sources. D65 light source was used as the standard light source, A and F2 light sources were used as the test light sources, a large number of color blocks were chosen as samples, and the color difference of the sample under different light sources was used to measure the color stability of the sample under different light sources. Firstly, by analyzing samples with different excitation purity, it was found that there was a positive correlation between the color difference and the excitation purity; Secondly, by analyzing samples with different dominant wavelength/complementary wavelength, it was found that the color difference was related to the dominant wavelength/complementary wavelength closely. When the dominant wavelength of the sample was 479 nm, ΔE_ab^*(D65/A), ΔE_ab^*(D65/F2) were 14.50, 13.81 respectively. When the dominant wavelength of the sample was 561 nm, ΔE_ab^*(D65/A), ΔE_ab^*(D65/F2) were only 5.17, 2.78 respectively. After corresponding to the dominant wavelength/complementary wavelength and the hue, it showed that the samples with purple, yellow, yellow-green hue had smaller color difference under different light sources, while the samples with red, cyan, light blue hue had larger color difference. The results showed that the color stability under different light sources was related to the excitation purity and the dominant wavelength/complementary wavelength. In actual production and application, there are two ways to improve the color stability of the product under different light sources, one is to choose a color with lower excitation purity, and the other is to choose a color with purple, yellow, yellow green hue.