Optical Engineering 49共3兲, 033602 共March 2010兲 Color quality scale Wendy Davis Abstract. The color rendering index 共CRI兲 has been shown to have de- Yoshi Ohno ficiencies when applied to white light-emitting-diode–based sources. Fur- National Institute of...
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Optical Engineering 49共3兲, 033602 共March 2010兲 Color quality scale Wendy Davis Abstract. The color rendering index 共CRI兲 has been shown to have de- Yoshi Ohno ficiencies when applied to white light-emitting-diode–based sources. Fur- National Institute of Standards and Technology thermore, evidence suggests that the restricted scope of the CRI unnec- 100 Bureau Drive, MS 8442 essarily penalizes some light sources with desirable color qualities. To Gaithersburg, Maryland 20899-8442 solve the problems of the CRI and include other dimensions of color E-mail: wendy.davis@nist.gov quality, the color quality scale 共CQS兲 has been developed. Although the CQS uses many of elements of the CRI, there are a number of funda- mental differences. Like the CRI, the CQS is a test-samples method that compares the appearance of a set of reflective samples when illuminated by the test lamp to their appearance under a reference illuminant. The CQS uses a larger set of reflective samples, all of high chroma,
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