# Responding to changing display modes on Apple TV Change images and resources dynamically when the screen gamut on your device changes. ## Discussion On Apple TV (5th generation), the assets required for an app depend on the screen gamut of the TV being used, with 4K TVs using the Display P3 gamut, and all other resolutions using the sRGB gamut. Also, the screen gamut of the TV can change at any time, switching between 4K and other resolutions. Your app needs to respond to these changes and present the appropriate assets when required. ### Create and place the image assets In Xcode, create an image asset in an asset catalog. In the Attributes inspector, configure the asset catalog to handle Display P3 images. In the Devices pane, ensure that Apple TV is selected. From the Gamut menu, select sRGB and Display P3. The following image shows the correct settings.  ### Add images to the asset catalog Place non-4K images in the 1x (sRGB) slot and 4K images in the 2x (Display P3) slot. The correct image is automatically loaded based on the display gamut of the TV. The following image shows assets placed in their correct containers.  ### Adapt to screen changes programmatically Implement the [`traitCollectionDidChange(_:)`](/documentation/UIKit/UITraitEnvironment/traitCollectionDidChange(_:)) method to respond to changing device traits. If your app performs expensive operations related to image generation based on the current display gamut, it’s important to verify that the display gamut has changed before performing these operations. The following code shows how to test whether the display gamut changed. ```swift override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) { let currentDisplayGamut = self.traitCollection.displayGamut if (previousTraitCollection?.displayGamut == .SRGB) && (currentDisplayGamut == .SRGB) { // Resolution didn't change. Your code goes here. } else if (previousTraitCollection?.displayGamut == .P3) && (currentDisplayGamut == .P3) { // Resolution didn't change. Your code goes here. } else { // Resolution changed. Your code goes here. } } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)