CIE 1960 Uniform Colour Space

CIE 1960 Uniform Colour Spaces has been superceded by the CIE 1976 UCS.

It does not define a luminance or Lightness component, but the Y Tristimulus value of the XYZ Colour Space or a lightness index similar to W* of the 1964 UCS (CIEUVW) are sometimes used.

Today, the CIE 1960 UCS is mostly used to calculate Correlated Colour Temperature, where the isothermal lines are perpendicular to the Planckian Locus.

Motivation

• Judd determined that a more uniform colour space could be found by a simple projective transformation of the CIEXYZ tristimulus values.