The current device-specific white balance values required for a neutral gray white point.
- iOS 8.0+
This property specifies the current red, green, and blue gain values derived from the current scene to deliver a neutral (or gray world) white point for white balance.
Gray world values assume a neutral subject (for example, a gray card) has been placed in the middle of the subject area and fills the center 50% of the frame. Clients can read these values and apply them to the device using
For each channel, only values between
max are supported. The value can be read at any time, regardless of white balance mode.
You can observe changes to the value of this property using Key-value observing.