colour.contrast.retinal_illuminance_Barten1999¶
- colour.contrast.retinal_illuminance_Barten1999(L, d=2.1, apply_stiles_crawford_effect_correction=True)[source]¶
Returns the retinal illuminance \(E\) in Trolands for given average luminance \(L\) and pupil diameter \(d\) using Barten (1999) method.
- Parameters
L (numeric or array_like) – Average luminance \(L\) in \(cd/m^2\).
d (numeric or array_like, optional) – Pupil diameter \(d\) in millimeters.
apply_stiles_crawford_effect_correction (bool, optional) – Whether to apply the correction for Stiles-Crawford effect.
- Returns
Retinal illuminance \(E\) in Trolands.
- Return type
ndarray
Notes
This definition is for use with photopic viewing conditions and thus corrects for the Stiles-Crawford effect by default, i.e. directional sensitivity of the cone cells with lower response of cone cells receiving light from the edge of the pupil.
References
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Examples
>>> retinal_illuminance_Barten1999(100, 2.1) 330.4115803... >>> retinal_illuminance_Barten1999(100, 2.1, False) 346.3605900...