1. Method for calculating a link for transforming a colorant vector of an object, the method comprising the steps of: determining for said object a forward look up table having first colorant vectors as entries and color vectors as data points, said look up table defining a forward transformation; and calculating a link look up table comprising said first colorant vectors as entries and second colorant vectors as data points; wherein said second colorant vectors are obtained by separating the data points of said first look up table by inverting said forward model in combination with separation parameters.