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
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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(100-4.6Ei)/8
Calculating XYZ
CAM02-UCS
(XYZ)-T
Ref. ill (SPD)
Ri
Test Source (SPD) CCT
(XYZ)-R
CRI-CAM02UCS=Σ(100-8Ei)/8
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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
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a*
b*
CIELAB
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D65
A
S B
S B
Metamerism
D65
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Colour Inconstant (B)
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Sample A
Sample B
Colour Inconstancy and Metamerism
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CRI (Lamp quality) CII (Sample quality)
R Calculating XYZ
(XYZ)-T (XYZ)-R
CAT02
(XYZ)-TR E00
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(100-4.6Ei)/8
E(U*V*W*)
Ri
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
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Colour inconstancy of Munsell samples
Datasets No. C*(D65)CII
CIE-CRI (Ra) 8 31 2.4NIST 15 54 3.8
Inter-obs. uncertainty in the data sets for developing CAT is about 3.0 E00 units.
Munsell
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Region
mean(A)mean(F11)mean(WLED)mean(RGBLED)mean(LEDON)mean(FL4)
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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).
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Datasets (4 lamps: WLED, LEDON, ICD, CFL)
Datasets No. C*(D65) CII Maxi (WLED)
CIE-CRI (Ra) 8 31 2.4 4.0NIST 15 54 3.8 8.1MCCC 24 34 2.4 7.9New 36 47 3.1 6.4
Observer variety in CA data set is about E00 of 3.0.
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A new dataset
Low CRI Large gamut Smooth gamut Colour shift Gamut difference
36 Munsell
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h*
C*
C*
36 Munsell
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h*
L*
L*
36 Munsell
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Trend of colour shifts
FL4 RGB LED
LEDONICD
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CDT Demonstration
Change of colour area (GAI)
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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.
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Luo et al’s Results
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Va
lues
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CIE
CR
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CIE-8
CIE-14
NIST
GMCC
Gamut0
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GM VV PH ZTB WLED TLED
CIE-8
CIE-14
NIST
GMCC
Gamut
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.