colour.CAM_Specification_ATD95¶
- class colour.CAM_Specification_ATD95(h, C, Q, A_1, T_1, D_1, A_2, T_2, D_2)[source]¶
Defines the ATD (1995) colour vision model specification.
This specification has field names consistent with the remaining colour appearance models in
colour.appearance
but diverge from Fairchild (2013) reference.- Parameters
h (numeric or array_like) – Hue angle \(H\) in degrees.
C (numeric or array_like) – Correlate of saturation \(C\). Guth (1995) incorrectly uses the terms saturation and chroma interchangeably. However, \(C\) is here a measure of saturation rather than chroma since it is measured relative to the achromatic response for the stimulus rather than that of a similarly illuminated white.
Q (numeric or array_like) – Correlate of brightness \(Br\).
A_1 (numeric or array_like) – First stage \(A_1\) response.
T_1 (numeric or array_like) – First stage \(T_1\) response.
D_1 (numeric or array_like) – First stage \(D_1\) response.
A_2 (numeric or array_like) – Second stage \(A_2\) response.
T_2 (numeric or array_like) – Second stage \(A_2\) response.
D_2 (numeric or array_like) – Second stage \(D_2\) response.
Notes
This specification is the one used in the current model implementation.
References
[], []
Create new instance of CAM_Specification_ATD95(h, C, Q, A_1, T_1, D_1, A_2, T_2, D_2)
- __init__()¶
Methods
__init__
()count
(value, /)Return number of occurrences of value.
index
(value[, start, stop])Return first index of value.
Attributes
A_1
Alias for field number 3
A_2
Alias for field number 6
C
Alias for field number 1
D_1
Alias for field number 5
D_2
Alias for field number 8
Q
Alias for field number 2
T_1
Alias for field number 4
T_2
Alias for field number 7
h
Alias for field number 0