This study investigates the distortion of visual colour harmony impression in case of different types of artificial changes among the perceptual attributes of test samples. A set of visual experiments were carried out to investigate the observer's colour harmony impression as a function of artificial distortions. The visual colour harmony impression of a colour combination appearing harmonious under a reference illuminant might decrease if the combination of samples is illuminated by different test light sources, especially RGB LED clusters. A new quantity, the so called Harmony Distortion Index (HDI) is defined to describe the harmony distortion property of light sources.
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