Content deleted Content added
Mindmatrix (talk | contribs) revert - rm promotional link disguised as a ref |
|||
| (4 intermediate revisions by 4 users not shown) | |||
Line 1:
{{Short description|
{{Use American English|date=March 2025}}
{{Use mdy dates|date=March 2025|cs1-dates=ly}}
Line 50:
The [[International Commission on Illumination|CIE]] assembled a committee to study the matter and accepted the proposal to use the latter approach, which has the virtue of not needing [[spectrophotometry]], with a set of [[Munsell color system|Munsell]] samples. Eight samples of varying hue would be alternately lit with two illuminants, and the color appearance compared. Since no color appearance model existed at the time, it was decided to base the evaluation on color differences in a suitable color space, [[CIE 1964 color space|CIEUVW]]. In 1931, the CIE adopted the first formal system of [[colorimetry]], which is based on the trichromatic nature of the [[human visual system]].<ref name="Color rendering: Beyond pride and prejudice - Rea - 2010 - Color Research & Application - Wiley Online Library" >{{cite journal |last1=Rea |first1=M. S. |last2=Freyssinier |first2=J. P. |title=Color rendering: Beyond pride and prejudice |journal=Color Research and Application |year=2010 |volume=35 |issue=6 |pages=401–409 |doi=10.1002/col.20562}}</ref><ref>{{cite magazine |title=Background |magazine=Guide to Light and Color in Retail Merchandising |volume=8 |issue=1 |date=March 2010 |page=5 |publisher=Alliance for Solid-State Illumination Systems and Technologies |url= http://www.lrc.rpi.edu/programs/solidstate/assist/pdf/AR-ColorGuideforRetailLighting-March2010.pdf}}</ref> CRI is based upon this system of colorimetry.<ref>{{cite web |last1=Rea |first1=M. |last2=Deng |first2=L. |last3=Wolsey |first3=R. |date=2004 |work=NLPIP Lighting Answers |title=Light Sources and Color |___location=Troy, NY |publisher=Rensselaer Polytechnic Institute |url=http://www.lrc.rpi.edu/nlpip/publicationDetails.asp?id=901&type=2 |access-date=June 17, 2010 |archive-url= https://web.archive.org/web/20100611200908/http://www.lrc.rpi.edu/nlpip/publicationDetails.asp?id=901&type=2 |archive-date=June 11, 2010 }}</ref>
To deal with the problem of having to compare light sources of different correlated color temperatures (CCT), the CIE settled on using a reference [[black body]] with the same color temperature for lamps with a CCT of under 5000 K, or a phase of CIE [[standard illuminant]] D (daylight) otherwise. This presented a continuous range of color temperatures to choose a reference from. Any chromaticity difference between the source and reference illuminants were to be abridged with a von Kries-type [[chromatic adaptation transform]]. There are two
==Test method==
Line 500:
==External links==
* [http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/appendixb1.asp MATLAB script for calculating measures of light source color], [[Rensselaer Polytechnic Institute]], 2004.
* [http://stacks.iop.org/0026-1394/46/704 Uncertainty evaluation for measurement of LED colour<!-- Should be Colour not Colour, it's part of an article title, do not "correct" it--> , Metrologia]
* [http://www1.eere.energy.gov/buildings/ssl/cri_leds.html Color Rendering Index and LEDs], [http://www.eere.energy.gov/ United States Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE)][bad link]
* [http://www.edaphic.com.au/knowledge-base/articles/light-articles/ What is the difference between CRI and CQS?]
▲* [http://www.edaphic.com.au/knowledge-base/articles/light-articles/ What is the difference between CRI and CQS?] {{Webarchive|url=https://web.archive.org/web/20150718064746/http://www.edaphic.com.au/knowledge-base/articles/light-articles/ |date=July 18, 2015 }}, Edaphic Scientific Knowledge Base
* [https://www.lumens.com/light-bulb-facts/color-rendering-index.html Understanding color rendering index for lighting], Lumens
| |||