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# CGImageDestinationAddAuxiliaryDataInfo(_:_:_:)

Sets the auxiliary data, such as mattes and depth information, that accompany the image.

```
func CGImageDestinationAddAuxiliaryDataInfo(_ idst: CGImageDestination, _ auxiliaryImageDataType: CFString, _ auxiliaryDataInfoDictionary: CFDictionary)
```

## Parameters

`idst`

The image destination to modify.

`auxiliaryImageDataType`

The type of auxiliary information you want to add. For a list of possible values, see [Auxiliary Data Types](/documentation/ImageIO/individual-image-properties#Auxiliary-Data-Types).

`auxiliaryDataInfoDictionary`

A dictionary that contains the [`kCGImageAuxiliaryDataInfoData`](/documentation/ImageIO/kCGImageAuxiliaryDataInfoData), [`kCGImageAuxiliaryDataInfoDataDescription`](/documentation/ImageIO/kCGImageAuxiliaryDataInfoDataDescription), and [`kCGImageAuxiliaryDataInfoMetadata`](/documentation/ImageIO/kCGImageAuxiliaryDataInfoMetadata) keys. Use those keys to describe the depth or matte information.

## Discussion

Call this method after you add an image to the image destination. This method adds the specified depth or matte information to the most recently added image.

---

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