Equations are provided for the transformation of skin tone and foliage colorimetric data from one CIE reference light source to another. The resultant data represent the colorimetric shift due to illuminant change only and do not incorporate any color-adaptation effects.
R. H. GRAY, "Transformation of Skin and Foliage Colorimetric Specifications between CIE Sources A and C," J. Opt. Soc. Am. 57, 1317-1319 (1967)