將過濾器應用於UIImage時，結果是倒過來的

Question

這實在讓我很煩。當我將UIImage轉換爲CIImage時，應用一個濾鏡，然後將圖像倒轉（對於橫向）或逆時針旋轉90度（對於縱向）。

var image:UIImage? 
var index:Int? 

@IBOutlet weak var photo: UIImageView! 

@IBAction func editImage(sender: UIBarButtonItem) { 
    println("editImage") 
    let beginImage = CIImage(image: self.image) 
    let filter = CIFilter(name: "CISepiaTone") 
    filter.setValue(beginImage, forKey: kCIInputImageKey) 
    filter.setValue(0.8, forKey: kCIInputIntensityKey) 
    let newImage = UIImage(CIImage: filter.outputImage) 
    self.photo.image = newImage 
} 

Answer 1

設置過濾圖像的圖像定向和比例回到原來的值：

let newImage = UIImage(CIImage:filter.outputImage, scale:self.image.scale, orientation:self.image.imageOrientation)