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# exposureOffset

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

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

## 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`](/documentation/SceneKit/SCNCamera/minimumExposure), [`maximumExposure`](/documentation/SceneKit/SCNCamera/maximumExposure), [`exposureOffset`](/documentation/SceneKit/SCNCamera/exposureOffset), and [`whitePoint`](/documentation/SceneKit/SCNCamera/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`](/documentation/SceneKit/SCNCamera/wantsHDR) value is <doc://com.apple.documentation/documentation/Swift/false>.

---

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