研究目的
To present a short overview of color rendering indices history with discussion about possible improvement of CIE color rendering index by gamut mapping.
研究成果
The investigation documents the sensitivity of color rendering calculation caused by the used set of color samples. It concludes that a final method for metric allowing calculation of color rendition must be sufficiently robust and independent on the used color sample set. The analysis shows that 99 samples appear as insufficient and agrees with other studies recommending the use of an increased number of testing colors more than 215, uniformly distributed in color space, preferably in CIE CAM02UCS version.
研究不足
The study highlights the sensitivity of color rendering calculation to the set of color samples used, suggesting that 99 samples may be insufficient for robust and independent metric calculation. It agrees with other studies recommending the use of more than 215 testing colors, uniformly distributed in color space.
1：Experimental Design and Method Selection:
The study reviews historical and current methods for evaluating color rendering properties of light sources, focusing on the CIE color rendering index (CRI) and its limitations, especially with solid-state light sources. It discusses the development of new metrics like the Color Quality Scale (CQS) and the IES TM-30-15 method.
2：Sample Selection and Data Sources:
The study uses a set of 99 Hejzlar samples, which cover color space uniformly, to compare with the standard set of samples used in the TM-30-15 method.
3：List of Experimental Equipment and Materials:
The study mentions the use of NIST CQS version
4：0 and IES Rf-Rg calculator (IES TM30-15), modified to include the 99 Hejzlar samples. Experimental Procedures and Operational Workflow:
The study compares the color quality parameters of five light sources using both the standard TM-30-15 method and the modified version with Hejzlar samples.
5：Data Analysis Methods:
The study analyzes the differences in fidelity and gamut indices obtained from both methods to assess the robustness and independence of the color rendering calculation on the used color sample set.
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