Table 2.
Criterion degree of metamerism na |
|||||||
---|---|---|---|---|---|---|---|
Illuminants | Scene | Estimate | 0 | 1 | 2 | 3 | 4 |
25,000 K–4000 K | vegetated | unconditional | −3.58 | −3.77 | −4.16 | −4.56 | −4.95 |
(0.42) | (0.34) | (0.36) | (0.43) | (0.50) | |||
conditional | −0.19 | −0.59 | −0.99 | −1.37 | |||
(0.14) | (0.28) | (0.45) | (0.60) | ||||
nonvegetated | unconditional | −3.43 | −3.71 | −4.32 | −4.80 | −5.29 | |
(0.40) | (0.33) | (0.31) | (0.41) | (0.55) | |||
conditional | −0.28 | −0.88 | −1.37 | −1.82 | |||
(0.13) | (0.40) | (0.56) | (0.64) | ||||
4000 K–6500 K | vegetated | unconditional | −3.57 | −3.91 | −4.81 | −5.78 | −6.32 |
(0.45) | (0.42) | (0.47) | (0.81) | (0.81) | |||
conditional | −0.34 | −1.24 | −2.11 | −2.65 | |||
(0.12) | (0.48) | (0.86) | (0.96) | ||||
nonvegetated | unconditional | −3.39 | −3.85 | −5.02 | −5.98 | −6.63 | |
(0.41) | (0.37) | (0.52) | (0.74) | (0.60) | |||
conditional | −0.45 | −1.63 | −2.51 | −3.13 | |||
(0.16) | (0.66) | (0.83) | (0.69) | ||||
25,000 K–6500 K | vegetated | unconditional | −3.58 | −3.91 | −4.67 | −5.36 | −6.06 |
(0.42) | (0.34) | (0.45) | (0.61) | (0.85) | |||
conditional | −0.34 | −1.09 | −1.80 | −2.35 | |||
(0.17) | (0.46) | (0.75) | (0.95) | ||||
nonvegetated | unconditional | −3.43 | −3.90 | −5.01 | −5.92 | −6.48 | |
(0.40) | (0.32) | (0.55) | (0.74) | (0.62) | |||
conditional | −0.47 | −1.55 | −2.41 | −2.97 | |||
(0.16) | (0.59) | (0.85) | (0.77) |
Entries show means (SDs) of log10 relative frequency over 29 predominantly vegetated scenes and 21 predominantly nonvegetated scenes under successive daylight illuminants labeled by correlated color temperature. Number of pairs of surfaces sampled in each scene was 4,498,500. Entries for n = 0 are for pairs of surfaces with subthreshold color differences, i.e., ΔE < ΔEthr, under the first illuminant and any color difference under the second illuminant; those for n = 1, …, 4 are for pairs of surfaces with ΔE < ΔEthr under the first illuminant and suprathreshold color differences under the second illuminant, i.e., ΔE ≥ ΔEthr, ΔE ≥ 2ΔEthr, ΔE ≥ 3ΔEthr, ΔE ≥ 4ΔEthr, respectively. Conditional relative frequencies are not defined for n = 0. The observer was the CIE 1964 standard observer.3