---
title: threshold
framework: coreimage
role: symbol
role_heading: Instance Property
path: coreimage/cilineoverlay/threshold
---

# threshold

A value that determines edge visibility.

## Declaration

```swift
var threshold: Float { get set }
```

## Discussion

Discussion Larger values thin out the edges.

## See Also

### Instance Properties

- [nrNoiseLevel](coreimage/cilineoverlay/nrnoiselevel.md)
- [nrSharpness](coreimage/cilineoverlay/nrsharpness.md)
- [contrast](coreimage/cilineoverlay/contrast.md)
- [edgeIntensity](coreimage/cilineoverlay/edgeintensity.md)
- [inputImage](coreimage/cilineoverlay/inputimage.md)