iOS 16 Lock Screen Depth Effects Explained

Apple's iOS 16 introduced a redesigned Lock Screen featuring a multi-layered photo Depth Effect that dynamically segments images to place subjects in front of the digital clock. This article provides a concise guide to how the Depth Effect works, the visual photo styles available to enhance it, compatible subject types, and the key limitations to keep in mind when configuring your Lock Screen.

The Multilayered Depth Effect

The primary depth feature in iOS 16 is the multilayered photo effect. Powered by the A12 Bionic chip and newer Neural Engine processing, the operating system uses machine learning to separate the foreground subject from the background. The system then renders the Lock Screen clock between these two visual layers, partially obscuring the bottom of the numbers behind the subject to create a distinct 3D poster look.

Compatible Photo Styles

When the Depth Effect is active, you can swipe horizontally in the Lock Screen editor to apply several photographic styles that alter both the foreground and background independently:

  • Natural: Preserves the original colors and lighting of your photo while applying the depth segmentation.
  • Studio: Lightens the background slightly while maintaining natural foreground tones to draw focus to the subject.
  • Black & White: Converts the entire image into a classic monochrome format while keeping the depth layering intact.
  • Color Backdrop: Isolates the foreground subject and replaces the natural background with a solid, customizable color gradient.
  • Duotone: Applies a two-tone color cast across the shadows and highlights of the entire image.
  • Color Wash: Adds a tinted translucent color overlay across the photo while maintaining background and foreground contrast.

Supported Image Subjects

The Depth Effect is not limited to Portrait Mode photos. The image segmentation algorithm recognizes depth in standard 2D photos containing:

  • People and faces
  • Pets and animals
  • Distinct architecture and monuments
  • Prominent flora, trees, and landscapes

For the effect to trigger, the image must have sharp focus on the primary subject and sufficient contrast against the background.

Limitations and Widget Restrictions

To use the Depth Effect properly, two major conditions must be met:

  1. Lock Screen Widgets: Adding widgets to the primary widget row below the clock automatically disables the Depth Effect. The interface prioritizes widget readability over visual layering.
  2. Subject Placement: The subject cannot cover more than approximately 50 percent of the clock. If the photo is zoomed in or repositioned so that the subject obscures too much of the time, the system will automatically turn the effect off. You can manually toggle the feature on or off via the three-dot menu in the bottom-right corner of the Lock Screen editor.