VISION EXPERIMENT ON CHROMA SATURATION FOR COLOUR QUALITY PREFERENCE

1Colour Rendering Index (CRI) often does not correlate well with visual evaluation of colour rendering of light sources at real illuminated scenes. The main reason is that CRI measures colour fidelity, while general users judge colour rendering based on their preference of object colour appearance, thus there is a need for a colour- preference based metric. Colour preference is mainly affected by saturation of object chroma. To obtain data for such colour preference evaluation, a series of vision experiments have been conducted using the NIST Spectrally Tunable Lighting Facility simulating an interior room, where 20 subjects viewed various fruits, vegetables, andtheir skin tones, under illumination of varied saturation levels at correlated colour temperatures (CCT) of 2700 K, 3500 K, and 5000 K. The results of the experiment show that subjects’ preference is consistently peaked at saturation level of ∆C ab ≈ 5 at all CCT conditions and for all target objects. The results may be useful to develop a colour preference metric.

• Cameron Miller
• Mira Fein
• Ohno

• Технические науки. Промышленность