colour.contrast.pupil_diameter_Barten1999¶

colour.contrast.pupil_diameter_Barten1999(L, X_0=60, Y_0=None)[source]¶

Returns the pupil diameter for given luminance and object or stimulus angular size using Barten (1999) method.

Parameters

L (numeric or array_like) – Average luminance \(L\) in \(cd/m^2\).
X_0 (numeric or array_like, optional) – Angular size of the object \(X_0\) in degrees in the x direction.
Y_0 (numeric or array_like, optional) – Angular size of the object \(X_0\) in degrees in the y direction.

References

Examples

>>> pupil_diameter_Barten1999(100, 60, 60)  
2.0777571...