notes - 1/14/2008 8:05:00 AM CIE L*a*b* (CIELAB) Most...

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14/01/2008 08:05:00 CIE L*a*b* (CIELAB) Most complete color model used to describe all colors visible to the human  eye An opponent system Developed by the CIE (International Commission of Illumination) CIELAB City University, London 1973 4 leading men in color o Ganz (Ceiba Geigy) o MacAdam (Kodak) o Robertson (NRC) o Wyszewcki (NRC) 3 parameters L (Luminance) L=0 is black, L=100 is white a* is position between red and green o Negative a values indicate green o Positive a values indicate red b* is position between yellow and blue o Negative b values indicate blue o Positive b values indicate yellow Additional values Chroma – how chromatic or saturated a color is o C* lab = (a* 2  +b* 2 ) 1/2
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o Hue angle – identifies what the hue is h ab   = tan -1 (b*/a*) Chroma ex: A* = 3 B* = 4 C* ab = (3*2 + 4*2) ½
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This note was uploaded on 04/21/2008 for the course M&P 072 taught by Professor Salvaggio during the Winter '07 term at RIT.

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notes - 1/14/2008 8:05:00 AM CIE L*a*b* (CIELAB) Most...

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