---
title: potentialEDRHeadroom
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uiscreen/potentialedrheadroom
---

# potentialEDRHeadroom

The screen’s maximum headroom when displaying extended dynamic range content.

## Declaration

```swift
var potentialEDRHeadroom: CGFloat { get }
```

## Discussion

Discussion Headroom is the ratio of the luminance of the screen’s brightest white to the luminance of standard dynamic range (SDR) white, in the screen’s native color space. The screen’s maximum headroom can change depending on its configuration, such as when referenceDisplayModeStatus changes. You can query this property even when the screen isn’t displaying extended dynamic range (EDR) content.

## See Also

### Getting the reference display mode status

- [referenceDisplayModeStatus](uikit/uiscreen/referencedisplaymodestatus-swift.property.md)
- [UIScreen.ReferenceDisplayModeStatus](uikit/uiscreen/referencedisplaymodestatus-swift.enum.md)
- [currentEDRHeadroom](uikit/uiscreen/currentedrheadroom.md)