---
title: kColorSyncConversionParamCurve4
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/kcolorsyncconversionparamcurve4
---

# kColorSyncConversionParamCurve4

A key for a parametric tone rendering curve of type 4, represented as a CFArray of seven Float32 CFNumbers.

## Declaration

```swift
var kColorSyncConversionParamCurve4: Unmanaged<CFString>!
```

## See Also

### Reading curves and matrices

- [kColorSyncConversionParamCurve0](colorsync/kcolorsyncconversionparamcurve0.md)
- [kColorSyncConversionParamCurve1](colorsync/kcolorsyncconversionparamcurve1.md)
- [kColorSyncConversionParamCurve2](colorsync/kcolorsyncconversionparamcurve2.md)
- [kColorSyncConversionParamCurve3](colorsync/kcolorsyncconversionparamcurve3.md)
- [kColorSyncConversionMatrix](colorsync/kcolorsyncconversionmatrix.md)