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Meta-Standards for Color Rendering Metrics and Implications for Sample Spectral Sets

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There is compelling, largely agreed-upon evidence that the CIE Color Rendering Index (CRI) is not a sufficiently accurate measure of the average color rendering difference between two different spectral irradiance distributions. This has become particularly evident with the consideration of white light sources employing several narrow band light emitters. In this presentation an approach is suggested for reducing the error, based on consideration of certain meta-standards for evaluation of proposed CRI calculation methods. Here we focus mainly on one such meta-standard-the idea that the spectral sensitivity of the CRI should be reasonably uniform and largely independent of the details of the selected sample set. A key problem with the current CRI calculation method, and some suggested improvements, has been their lack of this important characteristic. By employing this guiding principle, we have devised an improved sample set that substantially eliminates the problem of non-uniform spectral sensitivity.

Document Type: Research Article

Publication date: January 1, 2011

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.

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