Example of pixellating an image picked from a UIImagePickerController

Pixellate.swift

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
    @IBOutlet weak var imageView: UIImageView!
    
    @IBAction func choosePhoto(sender: UIButton) {
        let picker = UIImagePickerController()
        picker.delegate = self
        picker.sourceType = .SavedPhotosAlbum
        presentViewController(picker, animated: true, completion: nil)
    }
    
    @IBAction func takePhoto(sender: UIButton) {
        let picker = UIImagePickerController()
        picker.delegate = self
        picker.sourceType = .Camera
        presentViewController(picker, animated: true, completion: nil)
    }
    
    func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
        println("\(NSDate.date) Pixellating...")
        let inputImage = CIImage(CGImage: image.CGImage)
        let imageSize = inputImage.extent().size
        let pixellationOptions = [kCIInputImageKey: inputImage, kCIInputScaleKey: max(imageSize.width, imageSize.height) / 50]
        let pixellation = CIFilter(name: "CIPixellate", withInputParameters: pixellationOptions)
        let pixellatedImage = pixellation.outputImage
        imageView.image = UIImage(CIImage: pixellatedImage)
        println("\(NSDate.date) Done")
        dismissViewControllerAnimated(true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(picker: UIImagePickerController) {
        dismissViewControllerAnimated(true, completion: nil)
    }
}