Jisoo Hwang, Yejin Hong, Dong-Hoon Lee, Youngshin Kwak, Seongchong Park, Jae-Keun Yoo, and YoungJoo Chae, "Experimental method for measuring color appearance shifts in high-dynamic-range luminance conditions," J. Opt. Soc. Am. A 36, 1940-1948 (2019)
We present an experimental method to determine color appearance shifts under high-dynamic-range conditions. A couple of light booths with variable luminance provide high-dynamic-range luminance conditions, and a perceptual color shift between the two booths is determined using color appearance matching. For red, green, yellow, and blue groups of four surface color samples, color shifts were measured for nine subjects under a dual illumination at background luminance levels of $100\,\,{{\rm cd/m}^2}$ and $4700\,\,{{\rm cd/m}^2}$. We observed significant perceptual hue shifts toward blue with magnitudes of 2.5 to 3.9 and 5.0 to 6.9 CIELAB units, for the red and green samples, respectively, and decreases in chroma for most samples when changed from low to high luminances.
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Color differences between two booths were obtained by subtracting the color values of reference samples for the high-light booth (test booth) from the values for the low-light booth (reference booth).
The superscripts of ${x^{(L)}}$ and ${x^{(H)}}$ denote low-light booth and high-light booth, respectively. The subscripts of ${x_r}$ and ${x_t}$ represent reference sample and matched test sample, respectively. $x_t^{\:(H)}$ is the average value of overall observers’ selections.
Table 4.
Color Differences between Color-Appearance-Matched Pairsa
The color difference of which magnitude is larger than its uncertainty is indicated in bold.
The color difference between matched pair ($\Delta {x^m}$) is the difference in color quantity between a reference sample under low-light booth and the matched sample in high-light booth. $U(x)$ is the expanded measurement uncertainty of $x$ ($k = 2$).
Table 5.
Uncertainty of Color-Appearance-Matching Resolution
Color Group
(deg.)
R
0.70
1.02
0.82
1.24
0.91
0.020
Y
0.42
1.39
1.39
1.40
0.59
0.014
G
0.65
1.01
0.85
1.14
0.82
0.016
B
0.75
0.74
0.73
0.87
1.19
0.018
Table 6.
Uncertainty Budget for Color Difference of Matched Paira
Uncertainty Components
Standard Uncertainty
Inter-subject variability
1.31
Resolution
0.82
Combined uncertainty
1.54
The budget is on $\Delta {b^{*m}}$ for reference sample of S 0540-R.
Table 7.
Input Parameters Used in CIECAM02 Analysis
()
Reference booth with low luminance
97.8
100.0
108.0
50
20
0.69
1
1
Test booth withhigh luminance
96.5
100.0
107.5
2400
20
0.69
1
1
Tables (7)
Table 1.
Color Differences between Low- and High-Light Booths
Color differences between two booths were obtained by subtracting the color values of reference samples for the high-light booth (test booth) from the values for the low-light booth (reference booth).
The superscripts of ${x^{(L)}}$ and ${x^{(H)}}$ denote low-light booth and high-light booth, respectively. The subscripts of ${x_r}$ and ${x_t}$ represent reference sample and matched test sample, respectively. $x_t^{\:(H)}$ is the average value of overall observers’ selections.
Table 4.
Color Differences between Color-Appearance-Matched Pairsa
The color difference of which magnitude is larger than its uncertainty is indicated in bold.
The color difference between matched pair ($\Delta {x^m}$) is the difference in color quantity between a reference sample under low-light booth and the matched sample in high-light booth. $U(x)$ is the expanded measurement uncertainty of $x$ ($k = 2$).
Table 5.
Uncertainty of Color-Appearance-Matching Resolution
Color Group
(deg.)
R
0.70
1.02
0.82
1.24
0.91
0.020
Y
0.42
1.39
1.39
1.40
0.59
0.014
G
0.65
1.01
0.85
1.14
0.82
0.016
B
0.75
0.74
0.73
0.87
1.19
0.018
Table 6.
Uncertainty Budget for Color Difference of Matched Paira
Uncertainty Components
Standard Uncertainty
Inter-subject variability
1.31
Resolution
0.82
Combined uncertainty
1.54
The budget is on $\Delta {b^{*m}}$ for reference sample of S 0540-R.