# blurredRectangleGenerator() Generates a blurred rectangle. ``` class func blurredRectangleGenerator() -> any CIFilter & CIBlurredRectangleGenerator ``` ## Return Value A [`CIImage`](/documentation/CoreImage/CIImage) containing a blurred rectangle. ## Discussion Creates a [`CIImage`](/documentation/CoreImage/CIImage) containing a blurred rectangle. The resulting image size is the extent of the rectangle plus any additional space required for the blur effect. The blurred rectangle filter uses the following properties: - `extent`: A that defines the extent of the effect. - `color`: A [`CIColor`](/documentation/CoreImage/CIColor) specifying the color of the rectangle. - `sigma`: A `float` specifying the sigma for the Gaussian blur. The following code creates a filter that generates a blurred red rectangle with a width of 200 x 100 pixels. ```swift func blurredRectangle() -> CIImage { let filter = CIFilter.blurredRectangleGenerator() filter.extent = CGRect(x: 0, y: 0, width: 200, height: 100) filter.color = CIColor.red filter.sigma = 10.0 return filter.outputImage! } ```  --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)