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

2. Apparatus

3. Experiments Phase Scaling Method No. Ill. No. Obs No. Sam. No. Estim. Colour appearance Magnitude estimation 68251200 Colour fidelity Grey scale51025750 Colour preference Categorical judgement 21045900 Colour harmony Categorical judgement 11039390

4. 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 283-286 (May, 2005) –C. Li, M. R. Luo and C. J. Li, Quality of LED based daylight simulators, CGIV 2006, University of Leeds, UK, 247-250 (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, pp339-341 (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 201-204 (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, pp339-341 (July, 2007). Colour harmony

5. 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

6. 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