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Area Lighting / Colorimetry

IEV ref845-03-56

en
CIE 1976 L* a* b* colour space
CIELAB colour space
three-dimensional, approximately uniform colour space produced by plotting in rectangular coordinates L* a* b* quantities defined by the equations

{ L =116 ( Y/ Y n ) 1/3 16 Y/ Y n a * =500[ ( X/ X n ) 1/3 ( Y/ Y n ) 1/3 ] X/ X n b =200[ ( Y/ Y n ) 1/3 ( Z/ Z n ) 1/3 ] Z/ Z n }>0,008856 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaamaacmaaeaqabeaaca aMc8UaaGPaVlaaykW7caWGmbWaaWbaaSqabeaacqGHxiIkaaGccqGH 9aqpcaaIXaGaaGymaiaaiAdadaqadaqaamaalyaabaGaamywaaqaai aadMfadaWgaaWcbaGaaeOBaaqabaaaaaGccaGLOaGaayzkaaWaaWba aSqabeaacaaIXaGaai4laiaaiodaaaGccqGHsislcaaIXaGaaGOnai aaxMaacaWLjaWaaSGbaeaacaWLjaGaaGPaVlaaykW7caaMc8UaaGPa VlaaykW7caWGzbaabaGaamywamaaBaaaleaacaqGUbaabeaakiaayk W7caaMc8UaaGPaVlaaykW7aaaabaGaaGPaVlaaykW7caaMc8UacGPa VlaadggadaahaaWcbeqaaiaacQcaaaGccqGH9aqpcaaI1aGaaGimai aaicdadaWadaqaamaabmaabaWaaSGbaeaacaWGybaabaGaamiwamaa BaaaleaacaqGUbaabeaaaaaakiaawIcacaGLPaaadaahaaWcbeqaai aaigdacaGGVaGaaG4maaaakiabgkHiTmaabmaabaWaaSGbaeaacaWG zbaabaGaamywamaaBaaaleaacaqGUbaabeaaaaaakiaawIcacaGLPa aadaahaaWcbeqaaiaaigdacaGGVaGaaG4maaaaaOGaay5waiaaw2fa amaalyaabaGaaCzcaiaadIfaaeaacaWGybWaaSbaaSqaaiaab6gaae qaaOGaaGPaVlaaykW7aaaabaGaaGPaVlaaykW7caaMc8UaaGPaVlaa dkgadaahaaWcbeqaaiabgEHiQaaakiabg2da9iaaikdacaaIWaGaaG imamaadmaabaWaaeWaaeaadaWcgaqaaiaadMfaaeaacaWGzbWaaSba aSqaaiaab6gaaeqaaaaaaOGaayjkaiaawMcaamaaCaaaleqabaGaaG ymaiaac+cacaaIZaaaaOGaeyOeI0YaaeWaaeaacaWGAbGaai4laiaa dQfadaWgaaWcbaGaaeOBaaqabaaakiaawIcacaGLPaaadaahaaWcbe qaaiaaigdacaGGVaGaaG4maaaaaOGaay5waiaaw2faamaalyaabaGa aCzcaiaadQfaaeaacaWGAbWaaSbaaSqaaiaab6gaaeqaaOGaaGPaVl aaykW7aaaaaiaawUhacaGL9baacqGH+aGpcaqGWaGaaeilaiaabcda caqGWaGaaeioaiaaykW7caqG4aGaaeynaiaabAdaaaa@AB9D@

X, Y, Z describe the colour stimulus considered and Xn, Yn, Zn describe a specified white achromatic stimulus

Note – Approximate correlates of lightness, chroma and hue may be calculated as follows:

CIE 1976 lightness: L* = 116 (Y/Yn)1/3 − 16 where Y/Yn > 0,008 856

CIE 1976 a, b chroma: C*ab = (a*2 + b*2)1/2

CIE 1976 a, b hue-angle: hab = arctan (b */a *)


[SOURCE: CIE Publication CIE No. 15.2]


fr
espace chromatique L* a* b* CIE 1976, m
espace chromatique CIELAB, m
espace chromatique à trois dimensions approximativement uniforme, obtenu en portant en coordonnées rectangulaires les grandeurs L* a* b* définies par les équations

{ L =116 ( Y/ Y n ) 1/3 16 Y/ Y n a * =500[ ( X/ X n ) 1/3 ( Y/ Y n ) 1/3 ] X/ X n b =200[ ( Y/ Y n ) 1/3 ( Z/ Z n ) 1/3 ] Z/ Z n }>0,008856 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaamaacmaaeaqabeaaca aMc8UaaGPaVlaaykW7caWGmbWaaWbaaSqabeaacqGHxiIkaaGccqGH 9aqpcaaIXaGaaGymaiaaiAdadaqadaqaamaalyaabaGaamywaaqaai aadMfadaWgaaWcbaGaaeOBaaqabaaaaaGccaGLOaGaayzkaaWaaWba aSqabeaacaaIXaGaai4laiaaiodaaaGccqGHsislcaaIXaGaaGOnai aaxMaacaWLjaWaaSGbaeaacaWLjaGaaGPaVlaaykW7caaMc8UaaGPa VlaaykW7caWGzbaabaGaamywamaaBaaaleaacaqGUbaabeaakiaayk W7caaMc8UaaGPaVlaaykW7aaaabaGaaGPaVlaaykW7caaMc8UacGPa VlaadggadaahaaWcbeqaaiaacQcaaaGccqGH9aqpcaaI1aGaaGimai aaicdadaWadaqaamaabmaabaWaaSGbaeaacaWGybaabaGaamiwamaa BaaaleaacaqGUbaabeaaaaaakiaawIcacaGLPaaadaahaaWcbeqaai aaigdacaGGVaGaaG4maaaakiabgkHiTmaabmaabaWaaSGbaeaacaWG zbaabaGaamywamaaBaaaleaacaqGUbaabeaaaaaakiaawIcacaGLPa aadaahaaWcbeqaaiaaigdacaGGVaGaaG4maaaaaOGaay5waiaaw2fa amaalyaabaGaaCzcaiaadIfaaeaacaWGybWaaSbaaSqaaiaab6gaae qaaOGaaGPaVlaaykW7aaaabaGaaGPaVlaaykW7caaMc8UaaGPaVlaa dkgadaahaaWcbeqaaiabgEHiQaaakiabg2da9iaaikdacaaIWaGaaG imamaadmaabaWaaeWaaeaadaWcgaqaaiaadMfaaeaacaWGzbWaaSba aSqaaiaab6gaaeqaaaaaaOGaayjkaiaawMcaamaaCaaaleqabaGaaG ymaiaac+cacaaIZaaaaOGaeyOeI0YaaeWaaeaacaWGAbGaai4laiaa dQfadaWgaaWcbaGaaeOBaaqabaaakiaawIcacaGLPaaadaahaaWcbe qaaiaaigdacaGGVaGaaG4maaaaaOGaay5waiaaw2faamaalyaabaGa aCzcaiaadQfaaeaacaWGAbWaaSbaaSqaaiaab6gaaeqaaOGaaGPaVl aaykW7aaaaaiaawUhacaGL9baacqGH+aGpcaqGWaGaaeilaiaabcda caqGWaGaaeioaiaaykW7caqG4aGaaeynaiaabAdaaaa@AB9D@

X, Y, Z représentent le stimulus de couleur considéré et Xn, Yn, Zn un stimulus achromatique spécifié de couleur blanche.

Note – Les correspondants approximatifs de clarté, chroma et teinte peuvent être calculés comme suit:

clarté CIE 1976: L* = 116 (Y/Yn)1/3 − 16 où Y/Yn > 0,008 856

chroma a, b CIE 1976: C*ab = (a*2 + b*2)1/2

angle de teinte a, b CIE 1976: hab = arctan (b*/a*)


[SOURCE: Publication CIE N° 15.2]


ar
الأبعاد الثلاثية للألوان في الفراغ للجنة الإنارة الدولية

de
L* a* b* Farbenraum CIE 1976, m
CIELAB-Farbenraum, m

es
espacio de color CIELAB

fi
CIE:n vuoden 1976 Lab-väriavaruus
CIELAB-väriavaruus

it
spazio colorimetrico L a b CIE 1976
spazio colorimetrico CIELAB

ko
시아이이 1976 L* a* b* 색공간
시아이이엘에이비이 색공간

ja
CIE 1976 L* a* b*色空間

no
nb CIE 1976 L* a* b* fargerom, CIELUV-fargerom

nn CIE 1976 L* a* b* fargerom, CIELAB-fargerom

pl
przestrzeń barw CIE 1976 (L*, a*, b*)
przestrzeń barw CIELAB

pt
espaço cromático L*a*b* CIE 1977
espaço cromático CIELAB

sv
CIELAB-rymd

Publication date: 1987
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