---
title: "init(red:green:blue:alpha:)"
framework: appkit
role: symbol
role_heading: Initializer
path: "appkit/nscolor/init(red:green:blue:alpha:)"
---

# init(red:green:blue:alpha:)

Creates a color object with the specified red, green, blue, and alpha channel values.

## Declaration

```swift
init(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)
```

## Parameters

- `red`: The red channel value. If the value is outside of the range 0–1.0, the extended sRGB color space is used.
- `green`: The green channel value. If the value is outside of the range 0–1.0, the extended sRGB color space is used.
- `blue`: The blue channel value. If the value is outside of the range 0–1.0, the extended sRGB color space is used.
- `alpha`: The alpha (opacity), specified as a value from 0-1.0. Alpha values below 0 are interpreted as 0.0, and values above 1.0 are interpreted as 1.0.

## Discussion

Discussion This method accepts extended color component values. If the red, green, blue, or alpha values are outside of the 0-1.0 range, the method creates a color in the extended range color space. This method is provided for easier reuse of code that uses UIColor in iOS. Where possible, it is preferable to specify the colorspace explicitly using the init(srgbRed:green:blue:alpha:) or init(genericGamma22White:alpha:) method.

## See Also

### Creating a color using RGB components

- [init(srgbRed:green:blue:alpha:)](appkit/nscolor/init(srgbred:green:blue:alpha:)-9oz51.md)
- [init(displayP3Red:green:blue:alpha:)](appkit/nscolor/init(displayp3red:green:blue:alpha:).md)
- [init(calibratedRed:green:blue:alpha:)](appkit/nscolor/init(calibratedred:green:blue:alpha:).md)
- [init(deviceRed:green:blue:alpha:)](appkit/nscolor/init(devicered:green:blue:alpha:).md)