A method is provided. The method comprises receiving a signal representative of a first combined spectrophotometric response of a substrate and deposited colorant. The first combined spectrophotometric response is indicative of a combined reflectance of the substrate and deposited colorant under a first illumination condition. The method further comprises determining, from the received signal, and from a contribution term indicative of an effect of ultra-violet, UV, light on a combined reflectance of the substrate and deposited colorant, an estimate for a second combined spectrophotometric response of the substrate and deposited colorant under a second illumination condition. The first illumination condition or the second illumination condition is a UV-cut illumination condition.
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