Correspondence Between CIELAB and CIELUV Color Differences
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The CIE presently recommends two uniform color spaces, the CIE 1976 (L*u*v*)-space (CIELUV) and the CIE 1976 (L*a*b*)-space (CIELAB). With each of these spaces is associated a color-difference formula. Color differences calculated by one formula cannot readily be converted to color differences calculated by the other formula. A conversion factor such as ρ = ΔEuv*/ΔEab* cannot be determined uniquely. However, for any given location in color space, it is possible to determine a range, ρmin ⩽ ρ ⩽ ρmax, within which ρ must lie. Lines of constant ρmin and ρmax can be plotted in (L*a*b*)-space which indicate the range of ρ in (L*u*v*)-space.