colour.difference.delta_E_DIN99

colour.difference.delta_E_DIN99(Lab_1, Lab_2, textiles=False)

Returns the difference \(\Delta E_{DIN99}\) between two given CIE L*a*b* colourspace arrays using DIN99 formula.

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 \(\Delta E_{DIN99}\).

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

[ASTMInternational07]

Examples

>>> import numpy as np
>>> Lab_1 = np.array([60.2574, -34.0099, 36.2677])
>>> Lab_2 = np.array([60.4626, -34.1751, 39.4387])
>>> delta_E_DIN99(Lab_1, Lab_2)  # doctest: +ELLIPSIS
1.1772166...