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DIN6167.YellownessIndex The CIE Whiteness index is widely used in the industry for D65 for 2 or 10 deg observer.
DIN6167.YellownessIndex
DIN6167.YellownessIndex(XYZmatrix, illuminant = "C", observer = 2, RefWhite = get("XYZperfectreflectingdiffuser", envir = environment()))
CIE values for illuminant C
illuminant
observer
Reference White
Scandinavian Pulp, paper and board, 2003 Basic equations for optical properties SCAN-G 5:03 Revised 2003
# NOT RUN { XYZ<-c(0.11465380, 0.08391198, 0.08222077) DIN6167.YellownessIndex(XYZ) # }
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