colour.CAM_Specification_LLAB¶

class colour.CAM_Specification_LLAB(J: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, C: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, h: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, s: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, M: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, HC: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, a: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, b: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>)[source]¶

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

This specification has field names consistent with the remaining colour appearance models in colour.appearance but diverge from Fairchild (2013) reference.

Parameters

J (Optional[Union[float, numpy.ndarray]]) – Correlate of Lightness \(L_L\).
C (Optional[Union[float, numpy.ndarray]]) – Correlate of chroma \(Ch_L\).
h (Optional[Union[float, numpy.ndarray]]) – Hue angle \(h_L\) in degrees.
s (Optional[Union[float, numpy.ndarray]]) – Correlate of saturation \(s_L\).
M (Optional[Union[float, numpy.ndarray]]) – Correlate of colourfulness \(C_L\).
HC (Optional[Union[float, numpy.ndarray]]) – Hue \(h\) composition \(H^C\).
a (Optional[Union[float, numpy.ndarray]]) – Opponent signal \(A_L\).
b (Optional[Union[float, numpy.ndarray]]) – Opponent signal \(B_L\).

Return type

None

Notes

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

References

[Fai13e], [LLK96], [LM96]

__init__(J: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, C: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, h: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, s: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, M: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, HC: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, a: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>, b: typing.Optional[typing.Union[float, numpy.ndarray]] = <factory>) → None¶

Parameters

J (Optional[Union[float, numpy.ndarray]]) –
C (Optional[Union[float, numpy.ndarray]]) –
h (Optional[Union[float, numpy.ndarray]]) –
s (Optional[Union[float, numpy.ndarray]]) –
M (Optional[Union[float, numpy.ndarray]]) –
HC (Optional[Union[float, numpy.ndarray]]) –
a (Optional[Union[float, numpy.ndarray]]) –
b (Optional[Union[float, numpy.ndarray]]) –

Return type

None

Methods

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

Attributes

`fields`	Getter property for the fields of the `dataclass`-like class.
`items`	Getter property for the `dataclass`-like class items, i.e. the field names and values.
`keys`	Getter property for the `dataclass`-like class keys, i.e. the field names.
`values`	Getter property for the `dataclass`-like class values, i.e. the field values.
`J`
`C`
`h`
`s`
`M`
`HC`
`a`
`b`

colour.XYZ_to_LLAB

colour.VIEWING_CONDITIONS_LLAB