CIE XYZ and some of Its Derived Color Spaces

Functions for converting among CIE XYZ, xyY, Lab, and Luv. Calculate Correlated Color Temperature (CCT) and the Planckian and daylight loci. The XYZs of some standard illuminants and some standard linear chromatic adaptation transforms (CATs) are included. Three standard color difference metrics are included, plus the forward direction of the 'CIECAM02' color appearance model.

spacesXYZ

Possible future work:

• Add some non-linear Chromatic Adaptation Transform (CAT) methods.
• The CIE 1976 color difference metric certainly satisfies the triangle inequality, but what about the other metrics ? Write a vignette that investigates this question.