colour.difference.delta_E_CMC#

Compute the colour difference \(\Delta E_{CMC}\) between two specified CIE L*a*b* colourspace arrays using the Colour Measurement Committee recommendation.

The quasimetric has two parameters: lightness (l) and chroma (c), allowing users to weight the difference based on the ratio of l:c. Commonly used values are 2:1 for acceptability and 1:1 for the threshold of imperceptibility.

Parameters:

Lab_1 (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 100]) – CIE L*a*b* colourspace array 1.
Lab_2 (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 100]) – CIE L*a*b* colourspace array 2.
l (float) – Lightness weighting factor.
c (float) – Chroma weighting factor.

Returns:

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

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`Lab_1`	100	1
`Lab_2`	100	1

References

[Lin09b]

Examples

>>> Lab_1 = np.array([48.99183622, -0.10561667, 400.65619925])
>>> Lab_2 = np.array([50.65907324, -0.11671910, 402.82235718])
>>> delta_E_CMC(Lab_1, Lab_2)
0.8996999...

colour.difference.delta_E_CMC#

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