---
title: exposureOffset
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scncamera/exposureoffset
---

# exposureOffset

A logarithmic bias that adjusts the results of SceneKit’s tone mapping operation, brightening or darkening the visible scene.

## Declaration

```swift
var exposureOffset: CGFloat { get set }
```

## Discussion

Discussion When using a High Dynamic Range (HDR) camera, SceneKit applies a process called tone mapping to translate the wide range of luminance values in the visible scene to the narrower range of brightness values that can be shown on a display. SceneKit determines a tone mapping curve from the minimumExposure, maximumExposure, exposureOffset, and whitePoint properties, along with a measure of scene luminance. Use this property to bias the tone mapping curve. The default exposure offset is zero, specifying no bias. Positive values result in a brighter scene, and negative values result in a darker scene. This property has no effect if the wantsHDR value is false.

## See Also

### Adding High Dynamic Range Effects

- [wantsHDR](scenekit/scncamera/wantshdr.md)
- [averageGray](scenekit/scncamera/averagegray.md)
- [whitePoint](scenekit/scncamera/whitepoint.md)
- [minimumExposure](scenekit/scncamera/minimumexposure.md)
- [maximumExposure](scenekit/scncamera/maximumexposure.md)