colour.CAM_Specification_Hellwig2022

class colour.CAM_Specification_Hellwig2022(J: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, C: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, h: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, s: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, Q: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, M: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, H: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, HC: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, J_HK: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, Q_HK: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>)

Define the Hellwig and Fairchild (2022) colour appearance model specification.

Represent colour appearance attributes calculated by the Hellwig and Fairchild (2022) colour appearance model. The specification includes correlates for lightness, chroma, hue, saturation, brightness, colourfulness, and hue quadrature. This implementation supports the Helmholtz-Kohlrausch effect extension from [HSF22], providing adjusted lightness and brightness correlates that account for the increased brightness perception of highly saturated colours.

Parameters:

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

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

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

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

• Q (float | NDArrayFloat | None) – Correlate of brightness \(Q\).

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

• H (float | NDArrayFloat | None) – Hue \(h\) quadrature \(H\).

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

• J_HK (float | NDArrayFloat | None) – Correlate of lightness \(J_{HK}\) accounting for Helmholtz-Kohlrausch effect.

• Q_HK (float | NDArrayFloat | None) – Correlate of brightness \(Q_{HK}\) accounting for Helmholtz-Kohlrausch effect.

References

[FH22], [HF22], [HSF22]

__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>, Q: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, M: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, H: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, HC: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, J_HK: float | TypeAliasForwardRef('NDArrayFloat') | None = <factory>, Q_HK: 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)

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

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

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

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

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

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

Return type:

None

Methods

__init__(J, C, h, s, Q, M, H, HC, J_HK, Q_HK)
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.
J
C
h
s
Q
M
H
HC
J_HK
Q_HK