colour.CAM_Specification_LLAB

class colour.CAM_Specification_LLAB(J: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, C: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, h: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, s: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, M: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, HC: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, a: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, b: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>)

Define the :math:`LLAB(l:c)` colour appearance model specification.

This specification provides a standardized interface for the LLAB(l:c) model with field names consistent across all colour appearance models in colour.appearance. While the field names differ from the original Fairchild (2013) reference notation, they map directly to the model’s perceptual correlates.

Parameters:

• J (float | NDArrayFloat | None) – Correlate of lightness \(L_L\).

• C (float | NDArrayFloat | None) – Correlate of chroma \(Ch_L\).

• h (float | NDArrayFloat | None) – Hue angle \(h_L\) in degrees.

• s (float | NDArrayFloat | None) – Correlate of saturation \(s_L\).

• M (float | NDArrayFloat | None) – Correlate of colourfulness \(C_L\).

• HC (float | NDArrayFloat | None) – Hue \(h\) composition \(H^C\).

• a (float | NDArrayFloat | None) – Opponent signal \(A_L\).

• b (float | NDArrayFloat | None) – Opponent signal \(B_L\).

Notes

• This specification is the one used in the current model implementation.

References

[Fai13h], [LLK96], [LM96]

__init__(J: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, C: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, h: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, s: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, M: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, HC: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, a: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, b: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>) → None

Parameters:

• J (float | TypeAliasForwardRef('NDArrayFloat') | None)

• C (float | TypeAliasForwardRef('NDArrayFloat') | None)

• h (float | TypeAliasForwardRef('NDArrayFloat') | None)

• s (float | TypeAliasForwardRef('NDArrayFloat') | None)

• M (float | TypeAliasForwardRef('NDArrayFloat') | None)

• HC (float | TypeAliasForwardRef('NDArrayFloat') | None)

• a (float | TypeAliasForwardRef('NDArrayFloat') | None)

• b (float | TypeAliasForwardRef('NDArrayFloat') | None)

Return type:

None

Methods

__init__(J, C, h, s, M, HC, a, b)
arithmetical_operation(a, operation[, in_place])	Perform the specified arithmetical operation with the \(a\) operand on the dataclass-like class.

Attributes

fields	Getter for the fields of the dataclass-like class.
items	Getter for the dataclass-like class items, i.e., the field names and values.
keys	Getter for the dataclass-like class keys, i.e., the field names.
values	Getter for the dataclass-like class field values.
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