In this paper a method to assess the exact colour reproduction accuracy of a multispectral scanner capable to acquire digital images directly from paintings is first described. Then is presented an algorithm which compares two different digital true-colour reproduction of the same painting giving the chromatic distance between the two images. Such distance may be considered as a colour certification parameter of one of the two images when the other is takes as references (i.e. it approximates the original painting).
A. Abrardo, V. Cappellini, M. Cappellini, A. Mecocci, "Art-Works Colour Calibration by Using the VASARI Scanner" in Proc. IS&T 4th Color and Imaging Conf., 1996, pp 94 - 96, https://doi.org/10.2352/CIC.1996.4.1.art00026