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# VNImageOption

An option key passed into an image request handler that takes an auxiliary image.

```
struct VNImageOption
```

## Discussion

Pass an option key into the [`VNImageRequestHandler`](/documentation/Vision/VNImageRequestHandler) instance on creation or request.  Option keys are used to describe specific properties of an image or specify how an image needs to be handled.

## Topics

### Initializers

[`init(rawValue:)`](/documentation/Vision/VNImageOption/init(rawValue:))

Initializes an option key using its string name.

### Options Dictionary Keys

[`properties`](/documentation/Vision/VNImageOption/properties)

The dictionary from the image source that contains the metadata for algorithms like horizon detection.

[`cameraIntrinsics`](/documentation/Vision/VNImageOption/cameraIntrinsics)

An option to specify the camera intrinstics.

[`ciContext`](/documentation/Vision/VNImageOption/ciContext)

An option key to specify the context to use in the handler’s Core Image operations.


---

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