---
title: colorTransferFunction
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avvideocomposition/colortransferfunction
---

# colorTransferFunction

The transfer function used for video composition.

## Declaration

```swift
var colorTransferFunction: String? { get }
```

## Discussion

Discussion The default value is nil. When the value of this property is nil, the source’s transfer function is propagated and used. Valid values are those suitable for AVVideoTransferFunctionKey.

## See Also

### Inspecting the video composition

- [renderSize](avfoundation/avvideocomposition/rendersize.md)
- [renderScale](avfoundation/avvideocomposition/renderscale.md)
- [frameDuration](avfoundation/avvideocomposition/frameduration.md)
- [animationTool](avfoundation/avvideocomposition/animationtool.md)
- [colorPrimaries](avfoundation/avvideocomposition/colorprimaries.md)
- [colorYCbCrMatrix](avfoundation/avvideocomposition/colorycbcrmatrix.md)
- [customVideoCompositorClass](avfoundation/avvideocomposition/customvideocompositorclass.md)
- [outputBufferDescription](avfoundation/avvideocomposition/outputbufferdescription-3ayt8.md)
- [spatialVideoConfigurations](avfoundation/avvideocomposition/spatialvideoconfigurations-80iab.md)
- [AVSpatialVideoConfiguration](avfoundation/avspatialvideoconfiguration-swift.struct.md)