colour.RGB_luminance_equation#

colour.RGB_luminance_equation(primaries: ArrayLike, whitepoint: ArrayLike) → str[source]#

Return the luminance equation from given primaries and whitepoint.

Parameters:

primaries (ArrayLike) – Primaries chromaticity coordinates.
whitepoint (ArrayLike) – Illuminant / whitepoint chromaticity coordinates.

Returns:

Luminance equation.

Return type:

str

Examples

>>> p = np.array([0.73470, 0.26530, 0.00000, 1.00000, 0.00010, -0.07700])
>>> whitepoint = np.array([0.32168, 0.33767])
>>> RGB_luminance_equation(p, whitepoint)  
'Y = 0.3439664...(R) + 0.7281660...(G) + -0.0721325...(B)'