colour_hdri.average_luminance¶

colour_hdri.average_luminance(f_number, exposure_time, iso, k=12.5)[source]¶

Computes the average luminance from given image FNumber, Exposure Time and ISO values.

Parameters:	f_number (array_like) – Image FNumber. exposure_time (array_like) – Image Exposure Time. iso (array_like) – Image ISO. k (numeric, optional) – Reflected light calibration constant \(K\).
Returns:	Image average luminance.
Return type:	ndarray

References

Examples

>>> average_luminance(8, 1, 100)
0.125