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# properties

The key for image metadata properties.

```
static let properties: CIImageOption
```

## Discussion

To ensure that an image has no metadata properties, set the value of this key to `[NSNull null]`.

For more information about image metadata properties, see <doc://com.apple.documentation/documentation/ImageIO/image-properties> and <doc://com.apple.documentation/documentation/ImageIO/CGImageMetadata>.

---

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