colour.characterisation.optimisation_factory_Oklab_15

colour.characterisation.optimisation_factory_Oklab_15() → Tuple[NDArrayFloat, Callable, Callable, Callable]

Generate the objective function and CIE XYZ colourspace to optimisation colourspace/colour model function based on the Oklab colourspace.

The objective function computes the Euclidean distance between the training data RGB tristimulus values and the training data CIE XYZ tristimulus values in the Oklab colourspace.

Implement support for Finlayson et al. (2015) root-polynomials of degree 2 and produce 15 terms.

Returns:

\(x_0\) initial values, objective function, CIE XYZ colourspace to Oklab colourspace function and finaliser function.

Return type:

tuple

References

[FMH15]

Examples

>>> optimisation_factory_Oklab_15()
(array([ 1.,  0.,  0.,  0.,  0.,  0.,  0.,  1.,  0.,  0.,  0.,  0.,  0., 0.,  1.]), <function optimisation_factory_Oklab_15.<locals>.objective_function at 0x...>, <function optimisation_factory_Oklab_15.<locals>.XYZ_to_optimization_colour_model at 0x...>, <function optimisation_factory_Oklab_15.<locals>.finaliser_function at 0x...>)