基于Kubelka-Munk理论的矿物颜料颗粒光散射特性及颜色研究

Light Scattering Properties and Color Study of Mineral Pigment Particles Based on Kubelka-Munk Theory

针对矿物颜料颗粒大小对光学特性和颜色的影响问题,本文结合光散射理论和Kubelka-Munk理论构建单颜料颗粒的光学模型,将其映射到颜料介质群的光学特性中,建立光谱反射率、散射系数及吸收系数的微分映射模型。实验结果表明,颜料颗粒粒径尺寸与散射系数、光谱反射率、明度及三刺激值呈明显的负相关性。本研究验证了将光学理论和色彩学理论相结合的合理性,揭示了粒径变化对矿物颜料的光学特性及色度值的影响机理,为计算机配色中的彩绘文物修复提供了一定的理论工具价值。

To address the problem of the influence of mineral pigment particle size on optical properties and color,this paper combines light scattering theory and Kubelka-Munk theory to construct an optical model of single pigment particles,mapping it to the optical properties of the pigment media group,and establishes a differential mapping model of spectral reflectance,scattering coefficient and absorption coefficient.The experimental results show that the pigment particle size has a significant negative correlation with the scattering coefficient,spectral reflectance,luminosity and tri-stimulus values.This study verifies the rationality of combining optical theory and color theory,and reveals the mechanism of particle size variation on the optical properties and chromaticity values of mineral pigments,and provides some theoretical tool value for the restoration of painted relics in computer color matching.