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I've been developing an app for quite a while now and am soon to finish. I have been blurring some images using the UIImage+ImageEffects.h library, but now I want to switch to Gaussian blurring an UIImage

Is there any library or something similar that would allow me to gaussian blur an image in my app?

Samurai Jack
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Dan Moldovan
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2 Answers2

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I use following in my app. 

 func applyBlurEffect(image: UIImage){
    var imageToBlur = CIImage(image: image)
    var blurfilter = CIFilter(name: "CIGaussianBlur")
    blurfilter.setValue(imageToBlur, forKey: "inputImage")
    var resultImage = blurfilter.valueForKey("outputImage") as CIImage
    var blurredImage = UIImage(CIImage: resultImage)
    self.blurImageView.image = blurredImage

  }
bpolat
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    You can also use [__GPUImage__](https://github.com/BradLarson/GPUImage) to do many image filters too. _GPUImage_ is sometimes claimed to be faster than _Core Image_. But if you don't do extensive blurring (like animated blurring), I think _Core Image_ is the way to go :D – yusuke024 Nov 20 '14 at 17:49
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    This is the way to go; it's a true Gaussian blur convolution. Keep in mind, though, that it's a little slow on iOS! – matt Nov 20 '14 at 17:50
  • @SikhapolSaijit Good point, thanks for reminding us of GPUImage. – matt Nov 20 '14 at 17:51
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    Warning - this takes a few seconds to run. Definitely not practical if you need the blur on demand. – thedayturns Apr 28 '15 at 19:44
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I think UIBlurEffect is what you want, if you want to avoid the delay. The second half of this tutorial on Gaussian blur techniques in iOS 8 walks you through adding a UIBlurEffect to a UIImage.

Judson Douglas
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