Quiroga Mellado, Juan AntonioAlonso Fernández, JoséZoido, J.Bernabeu Martínez, Eusebio2023-06-202023-06-201994-09-101. D. H. Marimont and B. A. Wandell, "Linear models of surface and illuminant spectraº J. Opt. Soc. Am. A 9, 1905-1913 (1993). 2. W. K. Pratt, Digital Image Processing (Wiley, New York, 1991), Chaps. 12 and 13. 3. K. Engelhardt and P. Seitz, "Optimum color filters for CCD digital cameras”, Appl. Opt. 32, 3015-3023 (1993). 4. M. L. Simpson and J. F. Jansen, "Imaging colorimetry: a new approach”, Appl. Opt. 30, 4666-4671 (1991). 5. G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, New York, 1982), Chap. 3, p. 166.0003-693510.1364/AO.33.006139https://hdl.handle.net/20.500.14352/58804© 1994 Optical Society of America.Least-squares approximation can be used in image-based colorimetry once the set of sampling functions is selected. We discuss the accuracy obtained in earlier research, and we compare it with a better calculation method.engjournal articlehttp://dx.doi.org/10.1364/AO.33.006139http://www.opticsinfobase.org/open access535ColorimetryLeast-Squares FittingÓptica (Física)2209.19 Óptica Física