M. Melgosa, J. J. Quesada, and E. Hita, "Uniformity of some recent color metrics tested with an accurate color-difference tolerance dataset," Appl. Opt. 33, 8069-8077 (1994)
The Rochester Institute of Technology-Dupont dataset [Color Res. Appl. 16, 297–316 (1991)] has been used to analyze the uniformity of seven color metrics, developed after CIELUV and CIELAB, with methods similar to those previously applied to several other classical datasets [J. Opt. Soc. Am. A 9, 1247–1253 (1992)]. Significant performance improvements over CIELAB were found with several CIELAB-based metrics, mainly with the model recently proposed by Commission Internationale de L'Eclairage Technical Committee 1-29 [Color Res. Appl. 18, 137–139 (1993)]. Several significant differences found between some pairs of metrics became insignificant when we selected from the Rochester Institute of Technology-Dupont dataset pairs of samples with only chromaticity differences.
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Assignment of Numbers, Names, and Zones Selected for the cdf-G* and cdf-G** Sets of Formulas for Each of the 19 Color Centers of the RIT-Dupont Dataseta
Weighted Arithmetic Mean ΔE and Coefficients of Variation σ% of the Color-Difference Pairs Corresponding to Each of the 19 Color Centersa Calculated for Each of the Nine Color Metrics
Parameters Indicating the Size of the Color Differences 〈ΔE〉, the Homogeneity S1%, and the Isotropy S2% for each Color Metric and the Entire RIT-Dupont Database a,b
Parameter
CIELUV
CIELAB
JPC79
CMC(1:1)
BFD(1:1)
TC1-29
TC1-29*
CDF-G*
CDF-G**
〈ΔE〉
1.90
1.52
1.09
1.22
1.48
1.04
1.10
2.71
2.77
S1%
24.99
20.29
27.28
18.87
12.88
13.91
13.40
40.10
42.92
S2%
27.68
24.46
28.01
18.10
18.42
15.25
14.94
38.02
37.75
Ref. 20.
Small values of S1% and especially of S2% indicate a good color-metric performance.
Table 4
Parameters Indicating the Size of the Color Differences 〈ΔE〉, the Homogeneity S1%, and the Isotropy S2% for each Color Metric and Part of the RIT-Dupont Database, a,b the Pairs Having only a Chromaticity Difference
Parameter
CIELUV
CIELAB
JPC79
CMC(1:1)
BFD(1:1)
TC1-29
TC1-29*
CDF-G*
CDF-G**
〈ΔE〉
2.20
1.77
1.34
1.28
1.67
1.01
1.11
3.42
3.50
S1%
27.56
31.85
39.81
22.08
18.22
16.76
14.77
38.45
41.34
S2%
19.74
19.83
16.87
16.42
12.64
14.59
14.98
13.93
13.72
Ref. 20.
Small values of S1% and especially S2% indicate a good color-metric performance.
Table 5
Results of the Nonparametric H testa Applied to Test whether Several Different Sets of Color Metrics are Significantly Different
Results of the Nonparametric U Test a,b Applied to all Color-Metric Pairs Possible to Test Whether They Can be Considered Significantly Different
Color Metrics
CIELUV
CIELAB
JPC79
CMC(1:1)
BFD(1:1)
TC1-29
TC1-29*
CDF-G*
CDF-G**
CIELUV
112
169
67
60
39
38
49
46
CIELAB
174
118
132
124
76
71
59
62
JPC79
146
156
67.5
67
45
43
89
63
CMC(1:1)
145
153
180.5
175.5
135
125
10
10
BFD(1:1)
106
117
152
144
118
113
3
3
TC1-29
131
130
161
163
167
176
9
10
TC1-29*
130
144
161
165
164
175.5
10
11
CDF-G*
122
132
158
156
175
178
180
181
CDF-G**
121
132.5
158
157
175
174
177
180
Ref. 24.
The boldface numbers indicate the results from using the RIT-Dupont color pairs with only a chromaticity difference.
Tables (6)
Table 1
Assignment of Numbers, Names, and Zones Selected for the cdf-G* and cdf-G** Sets of Formulas for Each of the 19 Color Centers of the RIT-Dupont Dataseta
Weighted Arithmetic Mean ΔE and Coefficients of Variation σ% of the Color-Difference Pairs Corresponding to Each of the 19 Color Centersa Calculated for Each of the Nine Color Metrics
Parameters Indicating the Size of the Color Differences 〈ΔE〉, the Homogeneity S1%, and the Isotropy S2% for each Color Metric and the Entire RIT-Dupont Database a,b
Parameter
CIELUV
CIELAB
JPC79
CMC(1:1)
BFD(1:1)
TC1-29
TC1-29*
CDF-G*
CDF-G**
〈ΔE〉
1.90
1.52
1.09
1.22
1.48
1.04
1.10
2.71
2.77
S1%
24.99
20.29
27.28
18.87
12.88
13.91
13.40
40.10
42.92
S2%
27.68
24.46
28.01
18.10
18.42
15.25
14.94
38.02
37.75
Ref. 20.
Small values of S1% and especially of S2% indicate a good color-metric performance.
Table 4
Parameters Indicating the Size of the Color Differences 〈ΔE〉, the Homogeneity S1%, and the Isotropy S2% for each Color Metric and Part of the RIT-Dupont Database, a,b the Pairs Having only a Chromaticity Difference
Parameter
CIELUV
CIELAB
JPC79
CMC(1:1)
BFD(1:1)
TC1-29
TC1-29*
CDF-G*
CDF-G**
〈ΔE〉
2.20
1.77
1.34
1.28
1.67
1.01
1.11
3.42
3.50
S1%
27.56
31.85
39.81
22.08
18.22
16.76
14.77
38.45
41.34
S2%
19.74
19.83
16.87
16.42
12.64
14.59
14.98
13.93
13.72
Ref. 20.
Small values of S1% and especially S2% indicate a good color-metric performance.
Table 5
Results of the Nonparametric H testa Applied to Test whether Several Different Sets of Color Metrics are Significantly Different
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