colour.RGB_to_HCL

colour.RGB_to_HCL(RGB: ArrayLike, gamma: float = 3, Y_0: float = 100) → numpy.ndarray[source]

Convert from RGB colourspace to HCL colourspace according to Sarifuddin and Missaoui (2005) method.

Parameters

  • RGB (ArrayLike) – RGB colourspace array.

  • gamma (float) – Non-linear lightness exponent matching Lightness \(L^*\).

  • Y_0 (float) – White reference luminance \(Y_0\).

Returns

HCL array.

Return type

numpy.ndarray

Notes

Domain

Scale - Reference

Scale - 1

RGB

[0, 1]

[0, 1]

Range

Scale - Reference

Scale - 1

HCL

[0, 1]

[0, 1]

References

[SM05], [Wikipedia15]

Examples

>>> RGB = np.array([0.45620519, 0.03081071, 0.04091952])
>>> RGB_to_HCL(RGB)  
array([-0.0316785...,  0.2841715...,  0.2285964...])

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