colour.RLAB_Specification¶

class colour.RLAB_Specification[source]¶

Defines the RLAB 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 (numeric or array_like) – Correlate of Lightness \(L^R\).
C (numeric or array_like) – Correlate of achromatic chroma \(C^R\).
h (numeric or array_like) – Hue angle \(h^R\) in degrees.
s (numeric or array_like) – Correlate of saturation \(s^R\).
HC (numeric or array_like) – Hue \(h\) composition \(H^C\).
a (numeric or array_like) – Red-green chromatic response \(a^R\).
b (numeric or array_like) – Yellow-blue chromatic response \(b^R\).

Notes

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

References

[Fai96], [Fai13h]

Create new instance of RLAB_Specification(J, C, h, s, HC, a, b)

__init__()¶: Initialize self. See help(type(self)) for accurate signature.

Methods

`count`	Return number of occurrences of value.
`index`	Return first index of value.

Attributes

`C`	Alias for field number 1
`HC`	Alias for field number 4
`J`	Alias for field number 0
`a`	Alias for field number 5
`b`	Alias for field number 6
`h`	Alias for field number 2
`s`	Alias for field number 3