TIOParams.EXIF_BrightnessValue
TIOParams.EXIF_BrightnessValue
Declaration
property EXIF_BrightnessValue: Double;
Description
The brightness of the photo subject. Unit is APEX.
To calculate Exposure (Ev) from BrigtnessValue (Bv), you must add SensitivityValue(Sv).
Ev = Bv + Sv Sv = log2(ISOSpeedRating / 3.125)
ISO100: Sv = 5, ISO200: Sv = 6, ISO400: Sv = 7, ISO125: Sv = 5.32.