let newUser = NSEntityDescription.insertNewObjectForEntityForName("Users", inManagedObjectContext: context)

newUser.setValue(nameField.text, forKey: "username")

let picture = UIImageJPEGRepresentation(photoImageView.image!, 1);
newUser.setValue(picture, forKey: "image")

cell.imageView!.image = person.valueForKey("image") as? UIImage

[UIImage, imageWithData:self.myEvent.picture];