A data set for evaluating colour rendering property of sources Ronnier Luo June 2010.

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A data set for evaluating colour rendering property of sources Ronnier Luo June 2010

Colour Rendering Index Calculating XYZ (XYZ)-T Ref. ill (SPD) Test Source (SPD) CCT (XYZ)-R vK-CAT (XYZ)-TR U*V*W* CIE-CRI=Σ(  Ei)/8 Calculating XYZ CAM02-UCS (XYZ)-T Ref. ill (SPD) Ri Test Source (SPD) CCT (XYZ)-R CRI-CAM02UCS=Σ(100-8  Ei)/8

More information could be useful than just a single CRI number  CQS Gamut plot  Vector diagram  R1 =  E* ab /C* r  R2 =  Ch* ab /C* r Peter van der Burgt, Communication of colour rendering property of light sources

D65 A S B Metamerism D65 A Colour Inconstant (B) Colour Inconstancy and Metamerism

CRI(Lamp quality)CII (Sample quality) R Calculating XYZ (XYZ)-T(XYZ)-R CAT02 (XYZ)-TR  E 00 Ref. ill (D65, SPD ) Test Ill. (A, SPD) Calculating XYZ (XYZ)-T Ref. ill (SPD) Test Source (SPD) CCT (XYZ)-R vK-CAT (XYZ)-TR U*V*W* CIE-CRI=Σ(  Ei)/8  E(U*V*W*) RiRi CII: SO 105-J05 (2007), Textiles- tests for colour fastness – Part J05: method for the instrumental assessment of the colour inconstancy of a specimen with a change in illuminant

Colour inconstancy of Munsell samples Datasets No. C*(D65)CII CIE-CRI (Ra) NIST  Inter-obs. uncertainty in the data sets for developing CAT is about 3.0  E 00 units.

Generating a dataset  The data sets used  Munsell (1562 paint samples)  Philips (215 samples)  PCCS (1063 cotton samples)  The lamps used: WLED, LEDON, ICD, CFL  Optimisation criteria:  Average CII about 3.0,  More samples (36 samples around hue scale),  Larger colour gamut (higher C* range), and  Smooth gamut boundary (  L* and  C* ≤10 for neighbouring samples).

Datasets (4 lamps: WLED, LEDON, ICD, CFL) DatasetsNo.C*(D65)CIIMaxi (WLED) CIE-CRI (Ra) NIST MCCC New  Observer variety in CA data set is about  E 00 of 3.0.

A new dataset  Low CRI  Large gamut  Smooth gamut  Colour shift  Gamut difference

Trend of colour shifts FL4 RGB LED LEDON ICD

CDT Demonstration Change of colour area (GAI)

Similar gamuts from different datasets under WLED Philips Munsell PCCS No matter which data set is used, the samples found are quite similar for a fixed lamp.

Luo et al’s Results  Six lamps were tested using 5 datasets: Ra(8), Ri(14), NIST(15), MCCC(24) and Boundary (684).  Similar CRIs’ performance regardless the datasets used.