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Area Lighting / Colorimetry

IEV ref 845-23-068

Symbol
Tcp

en
correlated colour temperature
CCT
temperature of a Planckian radiator having the chromaticity nearest the chromaticity associated with the given spectral distribution on a modified 1976 UCS diagram where u , 2 3 v MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa GaaiilaiaaykW7daWcaaqaaiaaikdaaeaacaaIZaaaaiqadAhagaqb aaaa@3BA8@ are the coordinates of the Planckian locus and the test stimulus

Note 1 to entry: The concept of correlated colour temperature should not be used if the chromaticity of the test source differs more than ΔC= [ ( u t u p ) 2 + 4 9 ( v t v p ) 2 ] 1 2 =5× 10 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aabs5acaWGdbGaeyypa0ZaamWaaeaadaqadaqaaiqadwhagaqbamaa BaaaleaacaqG0baabeaakiabgkHiTiqadwhagaqbamaaBaaaleaaca qGWbaabeaaaOGaayjkaiaawMcaamaaCaaaleqabaGaaGOmaaaakiab gUcaRmaalaaabaqcLbuacaaI0aaakeaajugqbiaaiMdaaaGcdaqada qaaiqadAhagaqbamaaBaaaleaacaqG0baabeaakiabgkHiTiqadAha gaqbamaaBaaaleaacaqGWbaabeaaaOGaayjkaiaawMcaamaaCaaale qabaGaaGOmaaaaaOGaay5waiaaw2faamaaCaaaleqabaWaaSWaaWqa aiaaigdaaeaacaaIYaaaaaaakiabg2da9abaaaaaaaaapeGaaGynai abgEna0kaaigdacaaIWaWdamaaCaaaleqabaWdbiabgkHiTiaaikda aaaaaa@58A3@ from the Planckian radiator, where u t , v t MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa WaaSbaaSqaaiaabshaaeqaaOGaaiilaiaaykW7ceWG2bGbauaadaWg aaWcbaGaaeiDaaqabaaaaa@3C6F@ refer to the test source, and u p , v p MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa WaaSbaaSqaaiaabchaaeqaaOGaaiilaiaaykW7ceWG2bGbauaadaWg aaWcbaGaaeiCaaqabaaaaa@3C67@ to the Planckian radiator.

Note 2 to entry: Correlated colour temperature can be calculated by a simple minimum search computer program that searches for that Planckian temperature that provides the smallest chromaticity difference between the test chromaticity and the Planckian locus, or for example by a method recommended by Robertson, A.R. "Computation of correlated color temperature and distribution temperature", J. Opt. Soc. Am. 58, 1528-1535, 1968. (Note that the values in some of the tables in this reference are not up to date.)

Note 3 to entry: The chromaticity diagram originally used to determine the correlated colour temperature was the CIE 1960 uniform-chromaticity-scale diagram. The CIE 1976 uniform-chromaticity-scale diagram is a modified version of the CIE 1960 uniform-chromaticity-scale diagram and is equivalent to the (u, 3/2 v) diagram.

Note 4 to entry: The correlated colour temperature is expressed in kelvin (K).

Note 5 to entry: This entry was numbered 845-03-50 in IEC 60050-845:1987.

Note 6 to entry: This note applies to the French language only.


fr
température de couleur proximale, f
CCT, f
température d'un radiateur de Planck dont la chromaticité est la plus proche de celle associée à la répartition spectrale donnée sur un diagramme de chromaticité uniforme 1976 modifié où u , 2 3 v MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa GaaiilaiaaykW7daWcaaqaaiaaikdaaeaacaaIZaaaaiqadAhagaqb aaaa@3BA8@ sont les coordonnées du lieu des corps noirs et du stimulus d'essai

Note 1 à l'article: Il convient de ne pas appliquer la notion de température de couleur proximale si la chromaticité de la source d'essai diffère de plus de ΔC= [ ( u t u p ) 2 + 4 9 ( v t v p ) 2 ] 1 2 =5× 10 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aabs5acaWGdbGaeyypa0ZaamWaaeaadaqadaqaaiqadwhagaqbamaa BaaaleaacaqG0baabeaakiabgkHiTiqadwhagaqbamaaBaaaleaaca qGWbaabeaaaOGaayjkaiaawMcaamaaCaaaleqabaGaaGOmaaaakiab gUcaRmaalaaabaqcLbuacaaI0aaakeaajugqbiaaiMdaaaGcdaqada qaaiqadAhagaqbamaaBaaaleaacaqG0baabeaakiabgkHiTiqadAha gaqbamaaBaaaleaacaqGWbaabeaaaOGaayjkaiaawMcaamaaCaaale qabaGaaGOmaaaaaOGaay5waiaaw2faamaaCaaaleqabaWaaSWaaWqa aiaaigdaaeaacaaIYaaaaaaakiabg2da9abaaaaaaaaapeGaaGynai abgEna0kaaigdacaaIWaWdamaaCaaaleqabaWdbiabgkHiTiaaikda aaaaaa@58A3@ par rapport à celle du radiateur de Planck, où u t , v t MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa WaaSbaaSqaaiaabshaaeqaaOGaaiilaiaaykW7ceWG2bGbauaadaWg aaWcbaGaaeiDaaqabaaaaa@3C6F@ se rapportent à la source d'essai, et u p , v p MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyDayaafa WaaSbaaSqaaiaabchaaeqaaOGaaiilaiaaykW7ceWG2bGbauaadaWg aaWcbaGaaeiCaaqabaaaaa@3C67@ au radiateur de Planck.

Note 2 à l'article: La température de couleur proximale peut être calculée par un simple programme informatique de recherche minimale permettant de déterminer la température de Planck qui assure la plus petite différence de chromaticité entre la chromaticité d'essai et le lieu des corps noirs, ou par exemple, par une méthode recommandée par Robertson, A.R. "Computation of correlated color temperature and distribution temperature", J. Opt. Soc. Am. 58, 1528-1535, 1968. (Noter que les valeurs de certains des tableaux de cette référence ne sont pas actualisées.)

Note 3 à l'article: Le diagramme de chromaticité utilisé à l'origine pour déterminer la température de couleur proximale était le diagramme de chromaticité uniforme CIE 1960. Le diagramme de chromaticité uniforme CIE 1976 est une version modifiée du diagramme de chromaticité uniforme CIE 1960 et est équivalent au diagramme (u, 3/2 v).

Note 4 à l'article: La température de couleur proximale est exprimée en kelvin (K).

Note 5 à l'article: Cet article était numéroté 845-03-50 dans l'IEC 60050-845:1987.

Note 6 à l'article: Le terme abrégé "CCT" est dérivé du terme anglais développé correspondant "correlated colour temperature".


ar
درجة حرارة لون مناظرة
درجة حرارة لون مقاربة

de
ähnlichste Farbtemperatur, f

it
temperatura di colore prossimale
CCT

ko
상관 색온도

ja
相関色温度

pl
temperatura barwowa najbliższa, f

pt
temperatura de cor correlacionada

zh
相关色温

Publication date: 2020-12
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