Transforming CIE L*a*b* values to printer CMY values must be done when a colorimetric match is wanted for the printer output. The cost of such conversion is high. This paper describes a new efficient algorithm to perform this transformation. The computational cost is shown to be logarithmic in the number of sampling cells.
Wilkin Chau, William B. Cowan, "A fast iteration algorithm for mapping L*a*b* to CMY values" in Proc. IS&T 5th Color and Imaging Conf., 1997, pp 92 - 95, https://doi.org/10.2352/CIC.1997.5.1.art00018