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# kCIInputBiasKey

Simple bias value.

```
let kCIInputBiasKey: String
```

## Discussion

A key for the simple bias value to use along with the exposure adjustment ([`kCIInputEVKey`](/documentation/CoreImage/kCIInputEVKey)). The associated value must be an <doc://com.apple.documentation/documentation/Foundation/NSNumber> object that specifies floating-point value. The value has no effect if the image used for initialization is not RAW.

---

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