S. Sotiropoulou et Y. Chryssoulakis, An optimisation study of colour measurements on digitised slides of painted works of art, J S DYE COL, 116(1), 2000, pp. 23-31
This paper deals with the problem of the colorimetric fidelity of digitised
colour slides of painted works of art. A six-matrix conversion model was d
erived that permitted the transformation of any RGB device-dependent measur
ement on digitised colour slides to XYZ CIE 1931 device-independent values.
The model was calibrated against a reference colour chart. Eighty-one unif
ormly-painted colour samples were photographed together with a painting on
a 4 x 5 inch colour slide that was digitised using a high resolution scanne
r. A 3 x 3 transformation matrix, of the corrected R, G and B values and th
e respective X, Y and Z tristimulus values provided by spectrophotometry, w
as calculated. The calculated matrix was then applied to a 13th century Byz
antine fresco, captured on the same digitised slide, to transform the RGB m
easurements to XYZ CIE 1931 device-independent values which were then conve
rted into the L*a*b* CIE 1976 colorimetric system.