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.

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