基于GemDialogue色卡研究光源对绿松石颜色的影响

Effects on Light Sources to Turquoise Color Based on GemDialogue Color Chip

本文基于CIE 1976 L*a*b*均匀色空间,在D65光源、F2光源和A光源下采用便携式测色仪对GemDialogue色卡中与天然绿松石颜色相匹配的952组色带进行颜色测试,并通过CIE DE2000色差公式对"绿松石颜色"色带进行颜色指数分析。结果表明,D65光源下"绿松石颜色"的明度值更高、彩度值居中,更贴近于人眼在日光下的颜色感知;F2光源由于紫区存在高能辐射,与D65光源相比,其绿-蓝系列色带的彩度值略低,而蓝-紫系列色带的彩度值较高;A光源由于红区高能辐射,与D65光源相比中高彩度色带的彩度值更高,且对蓝色色带的彩度强化更显著,同时红色调对绿色、蓝色的中和作用导致整体"绿松石颜色"色调范围的减小。

Based on the CIE 1976 L*a*b* uniform color space, 952 pieces of color bands in GemDialogue which are matched with the colors of natural turquoise were measured by portable colorimeter under light source D65, F2 and A, as well as to take color parameter analysis by CIE DE2000 color difference formula. The results indicate that turquoise color has higher lightness and moderate chroma under D65, which looks more like the appearance of turquoise under the sunlight. Comparing with the light source D65, the light source F2 has higher power in purple visible light which makes green-blue turquoise display slightly lower chroma and makes blue-purple turquoise display higher chroma. However, as the light source A has high power in red visible light, it makes turquoises with middle-high chroma of show higher chroma especially for blue color band of turquoise;the hue angle range of turquoise color decreases in result of color mixing between red hue to green and blue under the light source A.