3 Real-Time Depth Control
iOS 12.1 adds a new feature specifically for users of the iPhone XS and iPhone XS Max: real-time Depth Control. While Depth Control was first introduced with those devices, the upcoming software update adds a new capability to the system.
Namely, you will be able to control the depth-of-field, or bokeh, of a particular Portrait Mode image while you’re taking it. Currently, the Depth Control setting only allows users to edit the background blur after the image has been taken.