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xyz2lab Converts XYZ coordinates to CIE lab.
xyz2lab
xyz2lab(C,bbb)
XYZ coordinates
Reference white, by default Observer = 2deg, Illuminant = D65
CIE lab coordinates
Logicol S.r.l., 2014 EasyRGB color search engine http://www.easyrgb.com/
# NOT RUN { xyz2lab(c(0.310897, 0.306510, 74.613450)) # }
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