colour.models.Jab_to_JCh

colour.models.Jab_to_JCh(Jab)[source]

Converts from Jab colour representation to JCh colour representation.

This definition is used to perform conversion from CIE L*a*b* colourspace to CIE L*C*Hab colourspace and for other similar conversions. It implements a generic transformation from Lightness \(J\), \(a\) and \(b\) opponent colour dimensions to the correlates of Lightness \(J\), chroma \(C\) and hue angle \(h\).

Parameters

Jab (array_like) – Jab colour representation array.

Returns

JCh colour representation array.

Return type

ndarray

Notes

Domain

Scale - Reference

Scale - 1

Jab

J : [0, 100]

a : [-100, 100]

b : [-100, 100]

J : [0, 1]

a : [-1, 1]

b : [-1, 1]

Range

Scale - Reference

Scale - 1

JCh

J : [0, 100]

C : [0, 100]

h : [0, 360]

J : [0, 1]

C : [0, 1]

h : [0, 1]

References

[CIET14804f]

Examples

>>> Jab = np.array([41.52787529, 52.63858304, 26.92317922])
>>> Jab_to_JCh(Jab)  
array([ 41.5278752...,  59.1242590...,  27.0884878...])