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Table 1.

Percentage of spectra with low chromatic discriminability in frog and bird visual systems

Visual system
Frog (f×f)
Bird (f×f)
Frog (f×b)
Bird (f×b)
Irradiance0 jnds0-3 jnds0 jnds0-3 jnds0 jnds0-3 jnds0 jnds0-3 jnds
D65 5.00 26.55 0.83 18.41 5.11 29.93 0.43 15.03 
D55 5.09 25.81 0.65 18.78 4.96 19.79 0.43 15.04 
D75 5.18 27.29 0.83 17.95 5.39 30.64 0.43 14.47 
Green 5.37 27.10 0.93 16.37 4.26 30.07 0.71 14.61 
Visual system
Frog (f×f)
Bird (f×f)
Frog (f×b)
Bird (f×b)
Irradiance0 jnds0-3 jnds0 jnds0-3 jnds0 jnds0-3 jnds0 jnds0-3 jnds
D65 5.00 26.55 0.83 18.41 5.11 29.93 0.43 15.03 
D55 5.09 25.81 0.65 18.78 4.96 19.79 0.43 15.04 
D75 5.18 27.29 0.83 17.95 5.39 30.64 0.43 14.47 
Green 5.37 27.10 0.93 16.37 4.26 30.07 0.71 14.61 

jnds, just-noticeable differences.

Values are percent of total spectra compared. (f×f), frog colors compared; (f×b), frog colors compared to backgrounds. Lower percentages show higher discrimination ability of the viewer.

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