---
title: "applyingGaussianBlur(sigma:)"
framework: coreimage
role: symbol
role_heading: Instance Method
path: "coreimage/ciimage/applyinggaussianblur(sigma:)"
---

# applyingGaussianBlur(sigma:)

Create an image by applying a gaussian blur to the receiver.

## Declaration

```swift
func applyingGaussianBlur(sigma: Double) -> CIImage
```

## Parameters

- `sigma`: The sigma of the gaussian blur to apply to the receiver. If the sigma is very small (less than 0.16) then the receiver is returned.

## Return Value

Return Value  An autoreleased CIImage instance or the received image.

## See Also

### Creating an Image by Modifying an Existing Image

- [applyingFilter(_:parameters:)](coreimage/ciimage/applyingfilter(_:parameters:).md)
- [applyingFilter(_:)](coreimage/ciimage/applyingfilter(_:).md)
- [transformed(by:)](coreimage/ciimage/transformed(by:).md)
- [transformed(by:highQualityDownsample:)](coreimage/ciimage/transformed(by:highqualitydownsample:).md)
- [cropped(to:)](coreimage/ciimage/cropped(to:).md)
- [oriented(forExifOrientation:)](coreimage/ciimage/oriented(forexiforientation:).md)
- [clampedToExtent()](coreimage/ciimage/clampedtoextent().md)
- [clamped(to:)](coreimage/ciimage/clamped(to:).md)
- [composited(over:)](coreimage/ciimage/composited(over:).md)
- [convertingWorkingSpaceToLab()](coreimage/ciimage/convertingworkingspacetolab().md)
- [convertingLabToWorkingSpace()](coreimage/ciimage/convertinglabtoworkingspace().md)
- [matchedToWorkingSpace(from:)](coreimage/ciimage/matchedtoworkingspace(from:).md)
- [matchedFromWorkingSpace(to:)](coreimage/ciimage/matchedfromworkingspace(to:).md)
- [premultiplyingAlpha()](coreimage/ciimage/premultiplyingalpha().md)
- [unpremultiplyingAlpha()](coreimage/ciimage/unpremultiplyingalpha().md)