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How can I change the color of the blur in a UIImage? I need a black blur and I don't know how to do it. I found another answer here in Stackoverflow (Blur UIImage to achieve effect like passcode blur of the wallpaper with swift). This answer is perfect, but the blur is light and I need it to be black. Can anyone help me? PS: The code below is the answer from the other question.

func applyBlurEffect(image: UIImage){
   var imageToBlur = CIImage(image: image)
   var blurfilter = CIFilter(name: "CIGaussianBlur")
   blurfilter.setValue(5, forKey: kCIInputRadiusKey)
   blurfilter.setValue(imageToBlur, forKey: "inputImage")
   var resultImage = blurfilter.valueForKey("outputImage") as! CIImage
   var blurredImage = UIImage(CIImage: resultImage)
   var cropped:CIImage=resultImage.imageByCroppingToRect(CGRectMake(0, 0,imageToBlur.extent().size.width, imageToBlur.extent().size.height))
   blurredImage = UIImage(CIImage: cropped)
   self.backgroundImage.image = blurredImage
}
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João Gabriel de Britto e Silva
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  • There is no such thing as "blur color". Blur is a convolution, though you can create your custom convolution with color weights, it's much simpler to use default CIGaussianBlur filter + some color filter. – kelin Feb 22 '17 at 13:18

1 Answers1

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let imageView = UIImageView(image: UIImage(named: "example"))
imageView.frame = view.bounds
imageView.contentMode = .ScaleToFill
view.addSubview(imageView)

let blurEffect = UIBlurEffect(style: .Dark)
let blurredEffectView = UIVisualEffectView(effect: blurEffect)
blurredEffectView.frame = imageView.bounds
view.addSubview(blurredEffectView)
Chirag Patel
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