colour.HelmholtzKohlrausch_effect_luminous_Nayatani1997¶
- colour.HelmholtzKohlrausch_effect_luminous_Nayatani1997(uv: ArrayLike, uv_c: ArrayLike, L_a: FloatingOrArrayLike, method: Union[Literal['VAC', 'VCC'], str] = 'VCC') FloatingOrNDArray [source]¶
Return the HKE factor for luminous colours using Nayatani (1997) method.
- Parameters
- Returns
Luminance factor (\(\Gamma\)) value(s) computed with Nayatani luminous colour estimation method.
- Return type
References
[Nay97]
Examples
>>> import colour >>> white = colour.xy_to_Luv_uv(colour.temperature.CCT_to_xy_CIE_D(6504)) >>> colours = colour.XYZ_to_xy( ... [colour.wavelength_to_XYZ(430 + i * 50) for i in range(5)]) >>> L_adapting = 65 >>> HelmholtzKohlrausch_effect_luminous_Nayatani1997( ... colour.xy_to_Luv_uv(colours), white, L_adapting) array([ 7.4460471..., 2.4767159..., 1.4723422..., 0.7938695..., 4.1828629...])