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# init(fromImageSourceAuxiliaryDataType:dictionaryRepresentation:)

Returns a new semantic segmentation matte instance from auxiliary image information in an image file.

```
convenience init(fromImageSourceAuxiliaryDataType imageSourceAuxiliaryDataType: CFString, dictionaryRepresentation imageSourceAuxiliaryDataInfoDictionary: [AnyHashable : Any]) throws
```

## Parameters

`imageSourceAuxiliaryDataType`

The `kCGImageAuxiliaryDataType` constants corresponding to the semantic segmentation matte being created (see `CGImageProperties`).

`imageSourceAuxiliaryDataInfoDictionary`

A dictionary of primitive semantic segmentation matte information obtained from <doc://com.apple.documentation/documentation/ImageIO/CGImageSourceCopyAuxiliaryDataInfoAtIndex(_:_:_:)>.

## Return Value

A new semantic segmentation matte instance, or `nil` if the auxiliary data info dictionary is malformed.

## Discussion

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