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blendWithAlphaMask()

Blends two images by using an alpha mask image.

Declaration

class func blendWithAlphaMask() -> any CIFilter & CIBlendWithMask

Return Value

The modified image.

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:

inputImage

An image with the type CIImage.

maskImage

An image that masks an area on the background image with the type CIImage.

backgroundImage

An image with the type CIImage.

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!
}

[Image]

See Also

Filters