Correct crop of CIGaussianBlur

Question

As I noticed when CIGaussianBlur is applied to image, image\'s corners gets blurred so that it looks like being smaller than original. So I figured out that I need to crop i

Answer 1

Here is Swift version:

func applyBlurEffect(image: UIImage) -> UIImage {
    let context = CIContext(options: nil)
    let imageToBlur = CIImage(image: image)
    let blurfilter = CIFilter(name: "CIGaussianBlur")
    blurfilter!.setValue(imageToBlur, forKey: "inputImage")
    blurfilter!.setValue(5.0, forKey: "inputRadius")
    let resultImage = blurfilter!.valueForKey("outputImage") as! CIImage
    let cgImage = context.createCGImage(resultImage, fromRect: resultImage.extent)
    let blurredImage = UIImage(CGImage: cgImage)
    return blurredImage

}