Indicates if the image file has an alpha channel.
- iOS 9.0+
- macOS 10.13+
- Mac Catalyst 13.0+
When the value of this property is 0, no alpha channel is used; when the value is 1, an alpha channel is used.
var aperture: NSNumber?
The size of the lens aperture at the time the image was captured, as a log-scale APEX value.
var fNumber: NSNumber?
The focal length of the lens divided by the diameter of the aperture when the image was captured.