colour.difference.delta_E_CIE2000#

colour.difference.delta_E_CIE2000(Lab_1: Domain100, Lab_2: Domain100, textiles: bool = False, *, additional_data: Literal[False] = False) → NDArrayFloat[source]#

colour.difference.delta_E_CIE2000(Lab_1: Domain100, Lab_2: Domain100, textiles: bool = False, *, additional_data: Literal[True]) → DeltaE_Specification_CIE2000

Compute the colour difference \(\Delta E_{00}\) between two specified CIE L*a*b* colourspace arrays using the CIE 2000 recommendation.

Parameters:

Lab_1 (Domain100) – CIE L*a*b* colourspace array 1.
Lab_2 (Domain100) – CIE L*a*b* colourspace array 2.
textiles (bool) – Textiles application specific parametric factors. \(k_L=2,\ k_C=k_H=1\) weights are used instead of \(k_L=k_C=k_H=1\).
additional_data (bool) – Whether to output additional data.

Returns:

Colour difference \(\Delta E_{00}\).

Return type:

numpy.ndarray or DeltaE_Specification_CIE2000

Notes

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

Parametric factors \(k_L=k_C=k_H=1\) weights under reference conditions:
- Illumination: D65 source
- Illuminance: 1000 lx
- Observer: Normal colour vision
- Background field: Uniform, neutral gray with \(L^*=50\)
- Viewing mode: Object
- Sample size: Greater than 4 degrees
- Sample separation: Direct edge contact
- Sample colour-difference magnitude: Lower than 5.0 \(\Delta E_{00}\)
- Sample structure: Homogeneous (without texture)

References

[Mel13], [SWD05]

Examples

>>> Lab_1 = np.array([48.99183622, -0.10561667, 400.65619925])
>>> Lab_2 = np.array([50.65907324, -0.11671910, 402.82235718])
>>> delta_E_CIE2000(Lab_1, Lab_2)
np.float64(1.6709303...)
>>> delta_E_CIE2000(
...     Lab_1,
...     Lab_2,
...     additional_data=True,
... )
DeltaE_Specification_CIE2000(dE=np.float64(1.6709303...), dL=np.float64(1.6670667...), dC=np.float64(0.1135407...), dH=np.float64(0.0022239...))
>>> delta_E_CIE2000(Lab_1, Lab_2, textiles=True)
np.float64(0.8412338...)
>>> delta_E_CIE2000(
...     Lab_1,
...     Lab_2,
...     textiles=True,
...     additional_data=True,
... )
DeltaE_Specification_CIE2000(dE=np.float64(0.8412338...), dL=np.float64(0.8335333...), dC=np.float64(0.1135407...), dH=np.float64(0.0022239...))

colour.difference.delta_E_CIE2000#

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