---
title: CGImageAlphaInfo.alphaOnly
framework: coregraphics
role: symbol
role_heading: Case
path: coregraphics/cgimagealphainfo/alphaonly
---

# CGImageAlphaInfo.alphaOnly

There is no color data, only an alpha channel.

## Declaration

```swift
case alphaOnly
```

## See Also

### Constants

- [CGImageAlphaInfo.first](coregraphics/cgimagealphainfo/first.md)
- [CGImageAlphaInfo.last](coregraphics/cgimagealphainfo/last.md)
- [CGImageAlphaInfo.none](coregraphics/cgimagealphainfo/none.md)
- [CGImageAlphaInfo.noneSkipFirst](coregraphics/cgimagealphainfo/noneskipfirst.md)
- [CGImageAlphaInfo.noneSkipLast](coregraphics/cgimagealphainfo/noneskiplast.md)
- [CGImageAlphaInfo.premultipliedFirst](coregraphics/cgimagealphainfo/premultipliedfirst.md)
- [CGImageAlphaInfo.premultipliedLast](coregraphics/cgimagealphainfo/premultipliedlast.md)