Values of the stimulus parameters (ρd, c, d) used for analysis
| Diffuse reflectance (ρd) | (c, d) | |||
|---|---|---|---|---|
| White ρd = 0.795 | (0.03, 1.00) | (0.06, 1.00) | (0.08, 1.00) | (0.10, 1.00) |
| (0.04, 0.93) | (0.06, 0.93) | (0.09, 0.93) | (0.11, 0.93) | |
| (0.04, 0.87) | (0.06, 0.87) | (0.09, 0.87) | (0.11, 0.87) | |
| (0.04, 0.80) | (0.06, 0.80) | (0.09, 0.80) | (0.11, 0.80) | |
| Gray ρd = 0.416 | (0.06, 1.0) | (0.10, 1.0) | (0.13, 1.0) | (0.16, 1.0) |
| (0.05, 0.93) | (0.10, 0.93) | (0.14, 0.93) | (0.17, 0.93) | |
| (0.05, 0.87) | (0.10, 0.87) | (0.14, 0.87) | (0.17, 0.87) | |
| (0.05, 0.80) | (0.10, 0.80) | (0.14, 0.80) | (0.18, 0.80) | |
| Black ρd = 0.004 | (0.10, 1.0) | (0.23, 1.0) | (0.32, 1.0) | (0.40, 1.0) |
| (0.11, 0.93) | (0.23, 0.93) | (0.34, 0.93) | (0.42, 0.93) | |
| (0.12, 0.87) | (0.24, 0.87) | (0.34, 0.87) | (0.43, 0.87) | |
| (0.12, 0.80) | (0.24, 0.80) | (0.34, 0.80) | (0.43, 0.80) | |
The parameters of 48 stimuli are separated into three sets according to their diffuse reflectance (ρd). In each set, the parameters of 16 stimuli are arranged in a 4 × 4 matrix corresponding to the arrangement of stimuli in Figures 1 and 2.