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An optimisation study of colour measurements on digitised slides of painted works of art
Author(s) -
Sotiropoulou Sophia,
Chryssoulakis Yannis
Publication year - 2000
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2000.tb00005.x
Subject(s) - rgb color model , computer graphics (images) , transformation matrix , fresco , transformation (genetics) , painting , matrix (chemical analysis) , computer science , mathematics , artificial intelligence , computer vision , art , materials science , visual arts , chemistry , physics , biochemistry , kinematics , classical mechanics , composite material , gene
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 derived that permitted the transformation of any RGB device‐dependent measurement on digitised colour slides to XYZ CIE 1931 device‐independent values. The model was calibrated against a reference colour chart. Eighty‐one uniformly‐painted colour samples were photographed together with a painting on a 4 × 5 inch colour slide that was digitised using a high resolution scanner. A 3 × 3 transformation matrix, of the corrected R, G and B values and the respective X, Y and Z tristimulus values provided by spectrophotometry, was calculated. The calculated matrix was then applied to a 13th century Byzantine fresco, captured on the same digitised slide, to transform the RGB measurements to XYZ CIE 1931 device‐independent values which were then converted into the L* a* b* CIE 1976 colorimetric system.