---
title: kCGImagePropertyAuxiliaryData
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimagepropertyauxiliarydata
---

# kCGImagePropertyAuxiliaryData

An array of dictionaries that contain auxiliary data for the images.

## Declaration

```swift
let kCGImagePropertyAuxiliaryData: CFString
```

## Discussion

Discussion The value of this key is a CFArray. Each CFDictionary in the array contains auxiliary data for one of the images in the file. Use the kCGImagePropertyAuxiliaryDataType key to determine the type of data associated with the image.

## See Also

### Auxiliary Image Data

- [kCGImagePropertyAuxiliaryDataType](imageio/kcgimagepropertyauxiliarydatatype.md)
- [kCGImageAuxiliaryDataInfoData](imageio/kcgimageauxiliarydatainfodata.md)
- [kCGImageAuxiliaryDataInfoDataDescription](imageio/kcgimageauxiliarydatainfodatadescription.md)
- [kCGImageAuxiliaryDataInfoMetadata](imageio/kcgimageauxiliarydatainfometadata.md)