Color rendering index: Difference between revisions

Revision as of 03:04, 17 November 2021

Revision as of 03:05, 17 November 2021

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== Criticism ==

{{missing information|section|CRI penalization of "pleasantpleasantly inaccurate", colorfulness-enhancing light – an important point in CQS and TM-30}}

Ohno and others have criticized CRI for not always correlating well with subjective color rendering quality in practice, particularly for light sources with spiky emission spectra such as fluorescent lamps or white [[Light-emitting diode|LED]]s. Another problem is that the CRI is discontinuous at 5000&nbsp;K,<ref>"Authors' response to SA Fotios and JA Lynes" in {{harvtxt|Sándor|Schanda|2005}}: "It is quite obvious that just at 5000&nbsp;K, where the reference illuminant has to be changed, the present system shows discontinuity."{{verification failed|date=September 2020}}</ref> because the chromaticity of the reference moves from the [[Planckian locus]] to the [[Standard illuminant#Illuminant series D|CIE daylight locus]]. {{harvtxt|Davis|Ohno|2006}} identify several other issues, which they address in their [[color quality scale]] (CQS):

* The color space in which the color distance is calculated (CIEUVW) is obsolete and nonuniform. Use [[CIELAB]] or [[CIELUV]] instead.