Depth Paper

Checker · Photo in, nothing out

Check a wallpaper for the depth effect: the parts you can fix

Pick a photo and your phone model. The page gives an exact resolution verdict against that model's native pixels, draws labeled bands for the status bar, clock and widgets at its proportions, and measures the contrast of the image behind the clock. The page decodes and measures the photo in your browser and does not upload it.

Image— Device— Size— Clock-band contrast— Subject band—

Your phone's own subject segmentation decides whether the depth effect switches on, and no site can run that model. This page checks the three failures you can fix: size, placement and clock-band legibility. The final call happens on the phone, so set the wallpaper there to see the result.

How this checker works

Three things are measured. First, size: your image's width and height are compared with the selected model's native panel resolution, from the same device table the wallpaper maker uses, where every entry is cross-checked against two independent published sources. An image equal to or larger than the panel in both dimensions passes. One smaller in either dimension fails, because the phone has to upscale it, and upscaling softens fine detail. Second, geometry: the overlay marks the status bar, the clock, the widget row and a subject zone as labeled wireframe bands, at the selected model's proportions. Third, local contrast: a conservative sample of the image behind the clock band, expressed as an estimate.

The page maps the image the way the phone does when it sets a wallpaper: the image is scaled to cover the panel and centered, and the clock band is projected through that same cover-fit onto your actual pixels. Inside that region, brightness is sampled on a grid of up to 64×64 points using the standard relative-luminance formula. For each of a white and a black clock, the checker finds the tenth percentile of the sampled contrast ratios, then reports the better of those two values. This helps expose mixed light and dark areas that a band average can hide. Roughly one in ten sampled points can have weaker contrast, including where digits fall. If sampled pixels are transparent, there is no estimate: flatten the image onto the intended background first. It cannot know the color the phone chooses or exactly where its digits will fall; small details can fall between samples, so check on the device. On iPhone models the bands come from the layout's point measurements (status bar 0–60 pt, clock 110–210 pt, widgets 220–290 pt), scaled to native pixels. Camera photos are drawn in their EXIF orientation, so a portrait shot is judged in portrait.

The iPhone band positions are approximations, recorded 2026-08-09 from published layout measurements, and they are close enough for placement guidance, which is all the bands are for. On Android phones the bands use typical proportions of the screen height instead. You judge subject placement by eye against the band shown, because only you know what the subject of your photo is.

Frequently asked questions

Why isn't depth effect working even though my photo looks fine?
Your phone decides. Its subject segmentation model has to find a clear subject before the clock will layer behind it. This checker covers the three causes you can fix: an image smaller than your screen's native pixels, a subject outside the band where the layering happens, and a clock area too busy or too mid-toned to read. If all three look right and the phone still declines, the segmentation isn't finding a subject it trusts, and a photo with a cleaner outline will do better.
Is my photo uploaded to check it?
The page reads and processes the selected image in your browser and does not upload it. Its security policy restricts script-initiated connections to this origin; ordinary navigation and browser extensions are outside that guarantee.
What do the outlined bands mean, and why don't they look like my lock screen?
They are neutral, labeled guide boxes: where the status bar sits, where the clock digits render, where widgets go, and the zone where a subject's top edge should land for the layered look. The page draws no system clock, no system fonts, and no hardware outlines. The bands are plain wireframes at the right proportions for the model you picked, and they are there to guide placement.
What does the clock-band contrast number mean?
The checker estimates the 10th-percentile sampled contrast for whichever of a white or black clock scores better. About one in ten sampled points can be weaker, including where the digits fall; the sample can miss small details and the phone chooses the tone. If sampled pixels are transparent, flatten the image onto your intended background first. Preview on the device.
Does this work for Android phones too?
Yes. The resolution verdict compares your image exactly with any listed model's native panel, Android phones included. The band overlay is approximate on Android, because lock-screen layouts vary by maker and launcher.

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