Color rendering index
A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with a natural or standard light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care and art restoration. It is defined by the International Commission on Illumination (CIE) as follows: Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference or standard illuminant.
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- enA color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with a natural or standard light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care and art restoration. It is defined by the International Commission on Illumination (CIE) as follows: Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference or standard illuminant.
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- enJanuary 2019
- enSeptember 2020
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- enyes
- Has abstract
- enA color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with a natural or standard light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care and art restoration. It is defined by the International Commission on Illumination (CIE) as follows: Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference or standard illuminant. The CRI of a light source does not indicate the apparent color of the light source; that information is given by the correlated color temperature (CCT). The CRI is determined by the light source's spectrum. An incandescent lamp has a continuous spectrum, a fluorescent lamp has a discrete line spectrum; implying that the incandescent lamp has the higher CRI. The value often quoted as "CRI" on commercially available lighting products is properly called the CIE Ra value, "CRI" being a general term and CIE Ra being the international standard color rendering index. Numerically, the highest possible CIE Ra value is 100 and would only be given to a source whose spectrum is identical to the spectrum of daylight, very close to that of a black body (incandescent lamps are effectively black bodies), dropping to negative values for some light sources. Low-pressure sodium lighting has a negative CRI; fluorescent lights range from about 50 for the basic types, up to about 98 for the best multi-phosphor type. Typical white-color LEDs have a CRI of 80 or more, while some manufacturers claim that their LEDs achieve a CRI of up to 98. CIE Ra's ability to predict color appearance has been criticized in favor of measures based on color appearance models, such as CIECAM02 and for daylight simulators, the CIE metamerism index. CRI is not a good indicator for use in visual assessment of light sources, especially for sources below 5000 kelvin (K). New standards, such as the IES TM-30, resolve these issues and have begun replacing the usage of CRI among professional lighting designers. However, CRI is still common among household lighting products.
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- Color rendering index
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- enColor rendering index
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- web.archive.org/web/20080922013149/http:/cie.kee.hu/newcie/publ/abst/135-99.html%7Carchive-date=2008-09-22
- cie.kee.hu/newcie/publ/abst/135-99.html%7Ctitle=Colour
- lrt.sagepub.com/content/47/2/177
- www.knt.vein.hu/staff/schandaj/SJCV-Publ-2005/462.pdf%7Carchive-url=https:/web.archive.org/web/20110721113839/http:/www.knt.vein.hu/staff/schandaj/SJCV-Publ-2005/462.pdf
- lrt.sagepub.com/content/47/1/54
- stacks.iop.org/0026-1394/46/704
- www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/appendixb1.asp
- cie2.nist.gov/LED_Sympo_2004/CIE_LED_symp04_prog_abstr.pdf%7Caccess-date=2008-07-18%7Carchive-url=https:/web.archive.org/web/20110721055141/http:/cie2.nist.gov/LED_Sympo_2004/CIE_LED_symp04_prog_abstr.pdf%7Carchive-date=2011-07-21
- physics.nist.gov/Divisions/Div844/facilities/vision/color.html
- web.archive.org/web/20090825230627/http:/physics.nist.gov/Divisions/Div844/facilities/vision/color.html
- www.lumens.com/light-bulb-facts/color-rendering-index.html
- nicolas.pousset.pagesperso-orange.fr/Recherche/Article/CQS.pdf
- web.archive.org/web/20071109105911/http:/www.lightinglab.fi/teaching/217/CRI_calculation.xls
- www1.eere.energy.gov/buildings/ssl/cri_leds.html
- www.cie.co.at/publ/abst/d002.html
- web.archive.org/web/20080305120337/http:/www.cie.co.at/publ/abst/d002.html%7Carchive-date=2008-03-05
- www.edaphic.com.au/knowledge-base/articles/light-articles/
- www.eere.energy.gov/
- web.archive.org/web/20110718171338/http:/www.lrc.rpi.edu/programs/solidstate/assist/recommends/lightcolor.asp
- www.nist.gov/manuscript-publication-search.cfm%3Fpub_id=840989
- www.slg.ch/pdf/publikation177.pdf
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- Academy of Motion Picture Arts and Sciences
- Applied Optics
- Arithmetic mean
- Artificial light
- Black body
- Category:Color
- Category:Lighting
- Ceramic discharge metal-halide lamp
- Chromatic adaptation
- Chromatic adaptation transform
- Chromaticity
- CIE 1931 color space
- CIE 1960 color space
- CIE 1964 color space
- CIECAM02
- CIELAB
- CIELUV
- CIE Standard Illuminant D65
- Color
- Color appearance model
- ColorChecker
- Color difference
- Colorimetric
- Colorimetry
- Color quality scale
- Color rendering
- Color temperature
- Conservation and restoration of cultural property
- Continuous spectrum
- Correlated color temperature
- Corresponding color
- Daylight
- Emission spectrum
- Euclidean distance
- Farnsworth-Munsell 100 hue test
- File:AmbientLED.png
- File:CIE 1960 UCS, FL4.svg
- File:CIE 1960 UCS.png
- File:CIE CRI TCS chromaticities.svg
- File:CIE CRI TCS SPDs.svg
- File:CIE CRI TCS under FL4.svg
- File:CIE illuminant F4 and a blackbody of 2938K.svg
- File:Planckian-locus.png
- File:Simple spectroscope.jpg
- Fluorescent lamp
- Fluorescent light
- Gamut
- Halogen lamp
- Helsinki University of Technology
- Human visual system
- IES TM-30
- Illumination (image)
- Incandescent lamp
- Incandescent light bulb
- Inner product
- International Commission on Illumination
- JOSA
- Kelvin
- Leaf
- LED
- LEDs
- Light
- Light-emitting diode
- Light source
- Low-pressure sodium light
- Mercury-vapor lamp
- Metal-halide lamp
- Metamerism (color)
- Metamerism index
- Munsell color system
- Neonatal nursing
- NIST
- Optics Express
- Planckian locus
- Rensselaer Polytechnic Institute
- Root-mean-square deviation
- Sodium-vapor lamp
- Solar spectrum
- Spectral power distribution
- Spectrophotometric
- Spectrophotometry
- Spectrum
- Standard illuminant
- Tristimulus value
- Von Kries transform
- W:Sodium-vapor lamp
- SameAs
- 2ZdHT
- Color rendering index
- Color rendering index
- Farbwiedergabeindex
- Farvegengivelsesindeks
- Indeks sesuaian warna
- Índex de reproducció cromàtica
- Index podání barev
- Indice de rendu de couleur
- Índice de reproducción cromática
- Indice di resa cromatica
- Kleurweergave-index
- m.04svxc
- Q27575
- Ra (ljus)
- Ra-indeks
- Värintoistoindeksi
- Współczynnik oddawania barw
- Індекс передавання кольору
- Индекс цветопередачи
- شناسه نمود رنگ
- مقياس التجسيد اللوني
- 演色性指數
- Subject
- Category:Color
- Category:Lighting
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