colour.appearance.coefficient_K_Br_Nayatani1997¶
- colour.appearance.coefficient_K_Br_Nayatani1997(L_a: FloatingOrArrayLike) FloatingOrNDArray [source]¶
Return the \(K_{Br}\) coefficient for Nayatani (1997) HKE computations.
- Parameters
L_a (FloatingOrArrayLike) – Adapting luminance in \(cd/m^2\).
- Returns
\(K_{Br}\) coefficient for Nayatani (1997) HKE methods.
- Return type
Notes
The \(K_{Br}\) coefficient is normalised to unity around \(63.66cd/m^2\).
References
[Nay97]
Examples
>>> L_a_values = [10 + i * 20 for i in range(5)] >>> coefficient_K_Br_Nayatani1997(L_a_values) array([ 0.7134481..., 0.8781172..., 0.9606248..., 1.0156689..., 1.0567008...]) >>> coefficient_K_Br_Nayatani1997(63.66) 1.0001284...