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# AVSemanticSegmentationMatte

An object that wraps a matting image for a particular semantic segmentation.

```
class AVSemanticSegmentationMatte
```

## Overview

The matting image stores its pixel data as <doc://com.apple.documentation/documentation/CoreVideo/cvpixelbuffer-q2e> objects in <doc://com.apple.documentation/documentation/CoreVideo/kCVPixelFormatType_OneComponent8> format. The image file contains the semantic segmentation matte as an auxiliary image, accessible using the ImageIO framework’s <doc://com.apple.documentation/documentation/ImageIO/CGImageSourceCopyAuxiliaryDataInfoAtIndex(_:_:_:)> function.

## Topics

### Creating a segmentation matte

[`init(fromImageSourceAuxiliaryDataType:dictionaryRepresentation:)`](/documentation/AVFoundation/AVSemanticSegmentationMatte/init(fromImageSourceAuxiliaryDataType:dictionaryRepresentation:))

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

[`replacingSemanticSegmentationMatte(with:)`](/documentation/AVFoundation/AVSemanticSegmentationMatte/replacingSemanticSegmentationMatte(with:))

Returns a semantic segmentation matte instance that wraps the replacement pixel buffer.

[`applyingExifOrientation(_:)`](/documentation/AVFoundation/AVSemanticSegmentationMatte/applyingExifOrientation(_:))

Returns a new semantic segmentation matte instance with the specified Exif orientation applied.

[`dictionaryRepresentation(forAuxiliaryDataType:)`](/documentation/AVFoundation/AVSemanticSegmentationMatte/dictionaryRepresentation(forAuxiliaryDataType:))

Returns a dictionary of primitive map information to use when writing an image file with a semantic segmentation matte.

### Inspecting a segmentation matte

[`matteType`](/documentation/AVFoundation/AVSemanticSegmentationMatte/matteType-swift.property)

The semantic segmentation matte image type.

[`AVSemanticSegmentationMatte.MatteType`](/documentation/AVFoundation/AVSemanticSegmentationMatte/MatteType-swift.struct)

A structure that defines the types of segmentation matte images that you can capture along with the primary image.

[`mattingImage`](/documentation/AVFoundation/AVSemanticSegmentationMatte/mattingImage)

The semantic segmentation matte’s internal image.

[`pixelFormatType`](/documentation/AVFoundation/AVSemanticSegmentationMatte/pixelFormatType)

The pixel format type for this object’s internal matting image.


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