The objectives of this paper were to evaluate the effects of colour measuring modes [specular component excluded (SCE) versus specular component included (SCI)] and the standard light source (C, A or D65) on the colour of shade guides. After the labial part of shade tabs of two shade guides (Vita and Chromascop) was polished flat up to no. 2400 silicone carbide paper, the colour was measured according to the International Commission on Illumination (CIE)L*a*b* colour scale on a spectrophotometer. In both shade guides, all the average CIE L* values of each shade series, and most of CIE b* values were different depending on the measuring mode (P < 0.01). However, there was no difference in CIE a* values depending on the measuring mode. Colour difference (deltaE*) between the values measured with SCE mode and with SCI mode was 3.21-6.50 in Vita shade guide, 3.22-5.47 in Chromascop shade guide. DeltaE* caused by the difference in light source was very small in Vita shade guide regardless of the measuring mode. In the Vita shade guide, the shade series (A-D) was negatively correlated with CIE L* and CIE a* values measured with SCE mode. In the Chromascop shade guide, the shade series (100-500) was negatively correlated with CIE L* value measured with SCI mode.
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机译：本文的目的是评估颜色测量模式[排除镜面反射分量（SCE）与包括镜面反射分量（SCI）]和标准光源（C，A或D65）对色标颜色的影响。将两个遮光罩（Vita和Chromascop）的遮光片的唇唇部分打磨至平整。 2400碳化硅纸，根据国际照明委员会（CIE）L * a * b *色标在分光光度计上测量颜色。在这两个阴影指南中，每个阴影系列的所有平均CIE L *值以及大多数CIE b *值均取决于测量模式（P <0.01）。但是，根据测量模式，CIE a *值没有差异。在Sita模式和SCI模式下测量的值之间的色差（deltaE *）在Vita阴影指南中为3.21-6.50，在Chromascop阴影指南中为3.22-5.47。无论测量模式如何，在Vita遮光罩中，由光源差异引起的DeltaE *很小。在Vita阴影指南中，阴影序列（A-D）与SCE模式下测得的CIE L *和CIE a *值负相关。在Chromascop阴影指南中，阴影系列（100-500）与SCI模式下测得的CIE L *值负相关。
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