Colour Rendering Research at Leeds Apparatus Colour rendering experiment –Colour appearance –Colour fidelity –Colour harmony –Colour preference Proposal –CRI-CAM02-UCS

Apparatus

Experiments Phase Scaling Method No. Ill. No. Obs No. Sam. No. Estim. Colour appearance Magnitude estimation Colour fidelity Grey scale Colour preference Categorical judgement Colour harmony Categorical judgement

Publications LED –C. Li, H. S. Xu, C.J. Li and M.R. Luo, Characterisation of LED Panel, The 10th Congress of the International Colour Association (AIC Colour’05), Granada, Spain (May, 2005) –C. Li, M. R. Luo and C. J. Li, Quality of LED based daylight simulators, CGIV 2006, University of Leeds, UK, (June, 2006). Colour appearance –C. Li, M.R. Luo and C.J. Li, Evaluation of LED sources based on colour appearance data, CIE 178:2007, CIE 26th Session Proceedings, Vol.1, D1- 162, Beijing, 2007 (July, 2007). –C. Li, M.R. Luo and C.J. Li, Evaluation of light sources based on colour appearance and colour preference assessments, AIC Color 2007, Colour science for industry, Hangzhou, pp (July, 2007). Colour fidelity –C. Li, M. R. Luo and C. Li, Evaluation of light sources based on visual colour rendering, The 16th Color Imaging Conference, IS&T and SID, Portland, Oregon (November, 2008). Colour preference –C. Li, M.R. Luo and C.J. Li, Evaluation of light sources based on colour appearance and colour preference assessments, AIC Color 2007, Colour science for industry, Hangzhou, pp (July, 2007). Colour harmony

A universal model CIECAM02 Chromatic adaptation Dynamic Transform Colour signal transform R G B R a G a B a J Q M C s H h X Y Z Colour appearance space J C H Q M H J’ M’ h Uniform Colour Space CAM02-LCD CAM02-UCS CAM02-SCD L a Y b Surround

CRI-CAM02UCS CIE CRI Test Source Reference Illuminant Equal CCT XYZ k,i CIE test samples XYZ r,i (J?,a? M, b? M ) k,i k,i (J?,a? M, b? M ) r,i k,i r,i ΔE? i CRI-CAM02UCS CIECAM02