colour.difference.delta_E_CIE1976

colour.difference.delta_E_CIE1976(Lab_1, Lab_2)

Returns the difference \(\Delta E_{76}\) between two given CIE L*a*b* colourspace arrays using CIE 1976 recommendation.

Parameters:

• Lab_1 (array_like) – CIE L*a*b* colourspace array 1.
• Lab_2 (array_like) – CIE L*a*b* colourspace array 2.

Returns:

Colour difference \(\Delta E_{76}\).

Return type:

numeric or ndarray

Notes

Domain	Scale - Reference	Scale - 1
Lab_1	L_1 : [0, 100] a_1 : [-100, 100] b_1 : [-100, 100]	L_1 : [0, 1] a_1 : [-1, 1] b_1 : [-1, 1]
Lab_2	L_2 : [0, 100] a_2 : [-100, 100] b_2 : [-100, 100]	L_2 : [0, 1] a_2 : [-1, 1] b_2 : [-1, 1]

References

[Lin03a]

Examples

>>> Lab_1 = np.array([100.00000000, 21.57210357, 272.22819350])
>>> Lab_2 = np.array([100.00000000, 426.67945353, 72.39590835])
>>> delta_E_CIE1976(Lab_1, Lab_2)  # doctest: +ELLIPSIS
451.7133019...