---
title: kColorSyncTransformUseITU709OETF
framework: colorsync
role: symbol
role_heading: Global Variable
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.13+, tvOS 16.0+, visionOS 1.0+, watchOS 9.0+]
path: colorsync/kcolorsynctransformuseitu709oetf
---

# kColorSyncTransformUseITU709OETF

A key whose CFBooleanRef value uses the ITU-R BT.709 opto-electronic transfer function.

## Declaration

```swift
var kColorSyncTransformUseITU709OETF: Unmanaged<CFString>!
```

## See Also

### Handling HDR and extended range

- [kColorSyncExtendedRange](colorsync/kcolorsyncextendedrange.md)
- [kColorSyncConvertUseExtendedRange](colorsync/kcolorsyncconvertuseextendedrange.md)
- [kColorSyncHDRDerivative](colorsync/kcolorsynchdrderivative.md)
- [kColorSyncPQDerivative](colorsync/kcolorsyncpqderivative.md)
- [kColorSyncHLGDerivative](colorsync/kcolorsynchlgderivative.md)