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

# colorTransferFunction

The transfer function used for video composition.

## Declaration

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

## Mentioned in

Tagging media with video color information

## 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

### Configuring color

- [colorPrimaries](avfoundation/avmutablevideocomposition/colorprimaries.md)
- [colorYCbCrMatrix](avfoundation/avmutablevideocomposition/colorycbcrmatrix.md)