---
title: "vImage.CompositeMode.premultipliedWithConstantAlpha(_:)"
framework: accelerate
role: symbol
role_heading: Case
path: "accelerate/vimage/compositemode/premultipliedwithconstantalpha(_:)"
---

# vImage.CompositeMode.premultipliedWithConstantAlpha(_:)

Performs premultiplied alpha compositing of two images, using a single alpha value for the entire image.

## Declaration

```swift
case premultipliedWithConstantAlpha(ComponentType)
```

## See Also

### Enumeration Cases

- [vImage.CompositeMode.nonpremultiplied](accelerate/vimage/compositemode/nonpremultiplied.md)
- [vImage.CompositeMode.nonpremultipliedToPremultiplied](accelerate/vimage/compositemode/nonpremultipliedtopremultiplied.md)
- [vImage.CompositeMode.premultiplied](accelerate/vimage/compositemode/premultiplied.md)