Study on the Effectiveness of Colour Quality Metrics in Preference Prediction at Different Illuminance Levels

摘要

Now many studies discuss the preferred correlated colour temperature (CCT) as well as the validity of colour quality metrics. However, most of them were implemented under a constant illuminance (E) level. In this study, three E levels (50, 200, 600 lx) and three CCT levels (3500, 5000, 6500 K) were adopted to illuminate six single-coloured decorative birds. Twenty participants, ten males and ten females, were invited to respond with their visual preference of the colour of the experimental birds. The purpose of this work is mainly to discuss the validity of colour preference metrics at different E levels, as well as to provide reference for the exhibition of artwork of monochromatic colours. Based on the subjective preference data, twenty-six colour quality metrics of light source were evaluated in this study. The results indicate that at different E levels, the average subjective preference increases with CCT, but the combination of high E level and high CCT will lead to a decline in preference due to over-whiteness-perception. In addition, the validity of metrics also varies with E levels while in general many metrics are highly correlated with the subjective preference.