土家织锦颜色在不同照明体下的主波长和色纯度

Dominant Wavelength and Color Purity of Tujia Brocade Color under Different Illuminants

表征颜色的色品值中,主波长和色纯度的优点是能给人以具体的印象,通过分析在6种不同标准照明下织锦颜色信息的主波长和兴奋纯度的表现,从物理测量和视觉感知相结合的角度,以最佳色彩稳定性和最小色差为依据,获得差异性最小的一组主波长与色纯度值作为表征织锦颜色的常用色品值数据库.利用分光测色计获取西兰卡普织锦典型颜色样本的光谱反射比数据,并通过理论计算,得出样本色在常用的6种标准照明体下的主波长与色纯度.选用变异系数来评价样本集的综合色差值指数和色彩稳定性指数,并结合色品图的对比分析,发现97.1%的典型样本色在标准照明体D50下的主波长和色纯度表征值与其他照明体的表征值差异最小,选用标准照明体D50下的主波长与色纯度的数字信息用以描述西兰卡普的典型颜色色度信息最为理想,与观察者感知颜色印象差异性最小.

Dominant wavelength and excitation purity can make specific impression on observers when they are used to represent chromaticity.From the perspective of combining physical measurement with vis-ual perception,the dominant wavelength and excitation purity of Tujia Brocade color were analysed under six kinds of illuminants.Based on the best color stability and the minimum color difference,we get a set of dominant wavelength and excitation purity as the frequently-used chromaticity database to describe Tujia brocade color.The color spectral reflectance of Xilankapu was acquired by a spectrophotometer,and the dominant wavelength and excitation purity of every color sample was calculated under 6 kinds of standard illuminant. After comparing coefficient of variation and referring to the distribution of color samples in the chromaticity diagram under different illuminants,the result shows that 97.1% of typical color samples per-form minimum difference when it is under illuminant D50. Therefore,using the dominant wavelength and excitation purity under illuminant D50 to describe the typical color information for Xilankapu is the best model,and there is minimum difference with observer′s impression.