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# settingContentAverageLightLevel(_:)

Create an image by changing the receiver’s contentAverageLightLevel property.

```
func settingContentAverageLightLevel(_ average: Float) -> CIImage
```

## Return Value


An autoreleased [`CIImage`](/documentation/CoreImage/CIImage).

## Discussion

Changing this value will alter the behavior of the `CIToneMapHeadroom` and `CISystemToneMap` filters.

- If the value is set to 0.0 or less then the returned image’s [`contentAverageLightLevel`](/documentation/CoreImage/CIImage/contentAverageLightLevel) is unknown.

---

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