基于色差分析的不同光源下颜色稳定性研究

产品颜色是衡量产品质量的重要指标，由于产品流通环境中光源的变化无法避免，产品颜色必然受到光源变化的影响，因此研究不同光源下颜色的稳定性具有现实意义。以D65光源为标准光源，以A光源、F2光源为试验光源，选择大量色块作为样品，用不同光源下样品色差大小来衡量不同光源下样品颜色稳定性。通过对不同兴奋纯度的样品的分析，发现样品色差与其兴奋纯度是正相关的；通过对不同主波长/补色波长的样品进行分析，发现样品色差与其主波长/补色波长密切相关。样品主波长在479 nm时，色差较大，ΔE_ab*（D65/A）、ΔE_ab*（D65/F2）分别为14.50、13.81；样品主波长在561 nm时，色差较小，ΔE_ab*（D65/A）、ΔE_ab*（D65/F2）分别为5.17、2.78。将主波长/补色波长与色相对应后，发现紫、黄、黄绿等色相的样品在不同光源下色差较小，而红、青、浅蓝等色相的样品在不同光源下色差较大。结果表明，不同光源下颜色稳定性与其兴奋纯度以及主波长/补色波长有关。在实际生产与应用中，可以通过以下2种方式提高不同光源下产品颜色的稳定性:一是选择兴奋纯度较低的颜色；二是选择特定色相如紫、黄、黄绿等色相的颜色。

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.