---
title: alpha
framework: metalperformanceshaders
role: symbol
role_heading: Instance Property
path: metalperformanceshaders/mpscnnlocalcontrastnormalization/alpha
---

# alpha

The “alpha” variable of the kernel function.

## Declaration

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

## Discussion

Discussion The default value is 1.0.

## See Also

### Instance Properties

- [beta](metalperformanceshaders/mpscnnlocalcontrastnormalization/beta.md)
- [delta](metalperformanceshaders/mpscnnlocalcontrastnormalization/delta.md)
- [p0](metalperformanceshaders/mpscnnlocalcontrastnormalization/p0.md)
- [pm](metalperformanceshaders/mpscnnlocalcontrastnormalization/pm.md)
- [ps](metalperformanceshaders/mpscnnlocalcontrastnormalization/ps.md)