---
title: c4
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/vimagetransferfunction/c4
---

# c4

The c4 in the transfer function.

## Declaration

```swift
var c4: CGFloat
```

## See Also

### Transfer function properties

- [c0](accelerate/vimagetransferfunction/c0.md)
- [c1](accelerate/vimagetransferfunction/c1.md)
- [c2](accelerate/vimagetransferfunction/c2.md)
- [c3](accelerate/vimagetransferfunction/c3.md)
- [cutoff](accelerate/vimagetransferfunction/cutoff.md)
- [gamma](accelerate/vimagetransferfunction/gamma.md)
- [c5](accelerate/vimagetransferfunction/c5.md)