You set a great photo as your Lock Screen, expecting the clock to slip neatly behind your dog's head. Instead the clock sits on top like a sticker, and the Depth Effect option is greyed out or missing.
Depth Effect is not broken. It is fussy. iOS only turns it on when several conditions are met at once, and if any of them fails it quietly switches the effect off without telling you why.
How Depth Effect Decides to Turn On
When you set a photo, iOS tries to separate the main subject from the background. If it can, it layers the subject on top of the clock. For that to happen:
- The iPhone has to support it (iOS 16 or later, so iPhone XS, XR and newer)
- iOS has to recognise a clear subject
- The subject has to overlap the clock by the right amount: enough to be visible, not so much that the time becomes unreadable
- Nothing else on the Lock Screen can be blocking it
- The wallpaper type has to support it
Each fix below matches one of those conditions.
Fix 1: Check That the Toggle Is On
In the Lock Screen editor, tap the **three dots** in the bottom right and look for **Depth Effect**. If it is there and unticked, tick it.
If it is there but greyed out, iOS has decided the photo does not qualify. Move on to the next fixes.
Fix 2: Remove Widgets to Test
On some iOS versions, adding a widget row under the clock disables Depth Effect. The two features compete for the same space.
Test it: long press the Lock Screen, tap **Customize**, then the Lock Screen, and remove the widgets under the clock. If the subject jumps in front of the time, you have found the cause. On that version you may have to choose between widgets and depth.
Fix 3: Reposition the Subject
This is the most common cause. If the subject covers too much of the clock, iOS turns the effect off so the time stays readable. If it does not reach the clock at all, there is nothing to layer.
In the editor, **pinch and drag the photo** so that:
- The top of the subject sits over the **lower part of the clock** digits, not over the whole thing
- The face or the most recognisable part stays fully in view
- There is clear space around the subject's outline
Small moves matter. Dragging the photo down a few millimetres is often enough to bring the effect back.
Fix 4: Use a Photo With a Clear Subject
Subject detection works best on:
- People and pets with a clean outline
- Buildings, mountains and trees against open sky
- Portrait mode photos, which already carry depth information
It struggles with:
- Busy scenes with many overlapping objects
- Low contrast (a dark subject on a dark background)
- Flat graphics, illustrations and abstract patterns
- Very low resolution images, where the edges are soft
If one photo will not cooperate, try a sharper version or a different shot of the same scene.
Fix 5: Check the Wallpaper Type
Not every Lock Screen style supports Depth Effect in the same way. Some live and animated styles, certain filters and some Photo Shuffle setups behave differently from a single still photo.
To rule this out, create a **new Lock Screen with a single still photo** and no filter. If Depth Effect works there, the issue was the style, not the image.
Fix 6: Turn Off Perspective Zoom
Perspective Zoom moves the wallpaper slightly as you tilt the phone, and it requires the image to be scaled up. That scaling can change how the subject lines up with the clock. In the Lock Screen editor's three-dot menu, turn Perspective Zoom off, then reposition the photo.
If your wallpaper also looks oddly cropped, why your iPhone wallpaper looks zoomed in covers the scaling side in detail.
Fix 7: Update iOS and Restart
Apple has adjusted how the Lock Screen clock and subject separation work across iOS releases, including how the clock can adapt its size around the subject on newer versions. If the effect behaves strangely on a photo that should qualify, update iOS and restart the phone before spending more time on it.
Picking Photos That Work Every Time
A quick checklist when choosing a Depth Effect wallpaper:
- One subject, simple background
- Subject in the middle or lower half, with its top edge level with the clock
- High resolution, ideally matching your screen (the iPhone wallpaper size guide lists exact resolutions per model)
- Good contrast between subject and sky or background
- Vertical framing, so you are not cropping a landscape photo down to a sliver
For the rest of the Lock Screen setup, including fonts, colours and multiple Lock Screens, see the Lock Screen customisation guide.
Finding Wallpapers With Walpium
Walpium is a wallpaper app for iPhone with curated 4K and HD collections and live wallpapers. High resolution, cleanly composed images give Depth Effect the sharp edges it needs, and a portrait-shaped wallpaper avoids the cropping that throws the subject out of position.
Worth knowing:
- It does not control Depth Effect. Whether the effect turns on is decided by iOS, so the fixes above still apply to any image, including ours
- Not every wallpaper is a Depth Effect wallpaper. Abstract patterns and gradients look great but have no subject to lift. Look for images with one clear subject
The Short Version
- Depth Effect needs iOS 16 or later, a supported iPhone and a clear subject
- If it is greyed out, reposition the photo so the subject only covers the lower part of the clock
- Remove Lock Screen widgets to test whether they are the cause on your iOS version
- Try a single still photo with no filter, and turn off Perspective Zoom
- Sharp, high resolution, single-subject photos work best