CIE94 – A New Colour-difference Formula

The Commission Internationale de L’Eclairage (CIE) has recently published a new colour-difference formula, called CIE94, for use in industial pass/fail colour-difference work. It is based in CIELAB colour space but on the CMC(l:c) colour-difference formula. In this paper the history behind the development of the new formula is outlined, before the formula itself is described and compared with the CMC(l:c) formula. The role of future work in this area is briefly reviewed and the attitude of the Society’s Colour Measurement Committee to CIE94 is outlined