Abstract
In this paper results of chromatic discrimination measurements obtained in two lighting scenarios are compared. Chromatic discrimination thresholds were measured in relation with systematically manipulated chromaticities seen under different visual angles. In both cases the Ellipse module of the Cambridge Colour Test (CCT) was obtained binocularly by normal colour-observers. Discrimination ellipses fitted to the measured thresholds were compared in terms of the adapting chromaticity and the visual angle of the adapting stimulus. Our findings show that changes in the reference chromaticity of the CCT have stronger effect on the elongation of the chromatic discrimination ellipses compared to the effect of the adapting chromaticity obtained in a light booth.Further comparison of discrimination thresholds estimated towards the confusion directions and the corresponding radii of the Ellipse test results suggests that the reliability of the Ellipse test results depends on the relation between the measurement directions and the confusion directions.
Highlights
Chromatic adaptation is a process which provides approximately constant appearance of colours under lights with different spectral content
Our findings show that changes in the reference chromaticity of the Cambridge Colour Test (CCT) have stronger effect on the elongation of the chromatic discrimination ellipses compared to the effect of the adapting chromaticity obtained in a light booth
4 Conclusion In our study chromatic discrimination ellipses of normal colour observers measured under two sets of chromatic adaptation conditions were compared
Summary
Chromatic adaptation is a process which provides approximately constant appearance of colours under lights with different spectral content. With the definition of the International Lighting Vocabulary (ILV) by CIE, chromatic adaptation is the "visual process whereby approximate compensation is made for changes in the colours of stimuli, especially in the case of changes in illuminants" [1]. Even though we experience in everyday life that chromatic adaptation performs quite well under white lights, the increasing number of applications of LED-based light sources might raise the question of limitations and extensions of the currently accepted adaptation models under coloured lights or incomplete adaptation [4,5,6,7,8,9,10]
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