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# kCVImageBufferPreferredCleanApertureKey

A key to the dictionary describing the preferred clean aperture for the image buffer.

```
let kCVImageBufferPreferredCleanApertureKey: CFString
```

## Discussion

The dictionary is of type <doc://com.apple.documentation/documentation/CoreFoundation/CFDictionary>. See [Image Buffer Clean Aperture Keys](/documentation/CoreVideo/image-buffer-clean-aperture-keys) for more information.

---

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