---
title: blendWithAlphaMask()
framework: coreimage
role: symbol
role_heading: Type Method
path: coreimage/cifilter-swift.class/blendwithalphamask()
---

# blendWithAlphaMask()

Blends two images by using an alpha mask image.

## Declaration

```swift
class func blendWithAlphaMask() -> any CIFilter & CIBlendWithMask
```

## Return Value

Return Value The modified image.

## Discussion

Discussion This method applies the blend with alpha mask filter to an image. The effect uses values from the grayscale mask image to interpolate between the input and background images. The mask image consists of shades of gray that define the strength of the interpolation from zero (where the mask image is black) to the specified radius (where the mask image is white). The blend with alpha mask filter uses the following properties: The following code creates a filter that results in the replacement of white in the mask image with the detail of the input image: func blendWithAlphaMask(inputimage: CIImage, backgroundimage: CIImage, maskimage: CIImage) -> CIImage {     let blendWithAlphaMaskFilter = CIFilter.blendWithAlphaMask()     blendWithAlphaMaskFilter.inputImage = inputimage     blendWithAlphaMaskFilter.maskImage = maskimage     blendWithAlphaMaskFilter.backgroundImage = backgroundimage     return blendWithAlphaMaskFilter.outputImage! }

## See Also

### Filters

- [blendWithBlueMask()](coreimage/cifilter-swift.class/blendwithbluemask().md)
- [blendWithMask()](coreimage/cifilter-swift.class/blendwithmask().md)
- [blendWithRedMask()](coreimage/cifilter-swift.class/blendwithredmask().md)
- [bloom()](coreimage/cifilter-swift.class/bloom().md)
- [cannyEdgeDetector()](coreimage/cifilter-swift.class/cannyedgedetector().md)
- [comicEffect()](coreimage/cifilter-swift.class/comiceffect().md)
- [coreMLModel()](coreimage/cifilter-swift.class/coremlmodel().md)
- [crystallize()](coreimage/cifilter-swift.class/crystallize().md)
- [depthOfField()](coreimage/cifilter-swift.class/depthoffield().md)
- [edges()](coreimage/cifilter-swift.class/edges().md)
- [edgeWork()](coreimage/cifilter-swift.class/edgework().md)
- [gaborGradients()](coreimage/cifilter-swift.class/gaborgradients().md)
- [gloom()](coreimage/cifilter-swift.class/gloom().md)
- [heightFieldFromMask()](coreimage/cifilter-swift.class/heightfieldfrommask().md)
- [hexagonalPixellate()](coreimage/cifilter-swift.class/hexagonalpixellate().md)