Is it somehow possible to get the white balance color temperature (and tint) from a camera preview or from a saved picture?
I am able to get other exposure values in real time based on this SO thread, like f-stop, exposure time, ISO, etc. The white balance always returns just 0, probably meaning "auto white balance". When I save an image from live preview the EXIF data has the white balance still just a zero.
I need to get the white balance color temperature in Kelvins the image/live camera preview was balanced to. I read some stuff about hidden APIs to get/set color temperature, but I cannot use hidden APIs. Any ideas if/how is this possible on iOS 7? Thank you.
No, I'm afraid it's not possible (at least not without the hidden APIs to which you refer—and they don't use degK, but some internal system). And yes, 0 is the code for Auto white balance (1 would be manual).