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. Author manuscript; available in PMC: 2007 Oct 22.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2006 Oct;23(10):2359–2372. doi: 10.1364/josaa.23.002359

Table 3.

Relative frequencies and conditional relative frequencies of metameric pairs of surfaces in natural scenes, calculated with color-difference formula CIEDE2000,3, 27 adaptation model CMCCAT2000,24 and nominal discrimination threshold ΔEthr = 1.0a

Criterion degree of metamerism na
Illuminants Scene Estimate 0 1 2 3 4
25,000 K–4000 K vegetated unconditional −2.74 −3.08 −3.86 −4.58 −5.33
(0.36) (0.33) (0.49) (0.65) (0.92)
conditional −0.34 −1.13 −1.84 −2.54
(0.15) (0.43) (0.69) (0.99)

nonvegetated unconditional −2.63 −3.09 −4.17 −5.09 −6.05
(0.35) (0.28) (0.44) (0.69) (0.84)
conditional −0.47 −1.54 −2.44 −3.29
(0.16) (0.56) (0.78) (0.92)
a

Other details as for Table 2.