Core Image能通過分析圖片的各個屬性,人臉的地區等進行自動最佳化圖片。我們只需要調用autoAdjustmentFiltersWithOptions這個API方法擷取各個自動增強濾鏡來最佳化圖片即可。不管是人物照片還是風景照均可增強效果。
(以前另外還有個叫autoAdjustmentFilters的方法,現已廢除。)
1.具體使用的濾鏡如下:
(1)CIRedEyeCorrection:修複因相機的閃光燈導致的各種紅眼
(2)CIFaceBalance:調整膚色
(3)CIVibrance:在不影響膚色的情況下,改善映像的飽和度
(4)CIToneCurve:改善映像的對比
(5)CIHighlightShadowAdjust:改善陰影細節
2.autoAdjustmentFiltersWithOptions方法參數說明(字典類型):
(1)CIDetectorImageOrientation提供映像方向:使Core Image能更精確的定位到臉的位置,對CIRedEyeCorrection和CIFaceBalance濾鏡很有用。
(2)kCIImageAutoAdjustEnhance設為false :只需要消除紅眼,不要其他濾鏡
(3)kCIImageAutoAdjustRedEye設為false :消除紅眼不要,其他濾鏡都要
3.效果圖如下(右側為最佳化後的):
4.代碼如下(所有濾鏡都使用):
import UIKitclass ViewController: UIViewController{ @IBOutlet weak var imageView: UIImageView! //圖片原圖 lazy var originalImage: UIImage = { return UIImage(named: "IMG_0473.jpg") }()! lazy var context: CIContext = { return CIContext(options: nil) }() override func viewDidLoad() { super.viewDidLoad() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } //最佳化圖片 @IBAction func autoAdjustImage(sender: AnyObject) { var inputImage = CIImage(image: originalImage) let options:[String : AnyObject] = [CIDetectorImageOrientation:1] //圖片方向 let filters = inputImage!.autoAdjustmentFiltersWithOptions(options) //遍曆所有濾鏡,依次處理映像 for filter: CIFilter in filters { filter.setValue(inputImage, forKey: kCIInputImageKey) inputImage = filter.outputImage } let cgImage = context.createCGImage(inputImage!, fromRect: inputImage!.extent) self.imageView.image = UIImage(CGImage: cgImage) } //還原圖片 @IBAction func resetImage(sender: AnyObject) { self.imageView.image = originalImage }}
研究並自己敲一敲或者做成直接用的類是不錯的選擇.下面的地址不是寫死的,加了拍照最佳化的功能,代碼如下:(但是有一個BUG暫時無法解決,待解決了我再補充,大家自己用起來就知道在哪裡了)
import UIKit//從相簿選取或者拍照需要實現UIImagePickerControllerDelegate UINavigationControllerDelegateclass ViewController: UIViewController ,UIImagePickerControllerDelegate,UINavigationControllerDelegate{ @IBOutlet weak var imageView: UIImageView! var chooseImage: UIImage = UIImage() //圖片原圖// lazy var originalImage: UIImage = UIImage(named: "jobZ.png")!// // lazy var context: CIContext = CIContext(options: nil) lazy var context: CIContext = { return CIContext(options: nil) }() override func viewDidLoad() {// self.imageView.image = UIImage(named: "jobZ.png") } //美化圖片 @IBAction func autoAdjustImage(sender: UIButton) { var inputImage = CIImage(image: self.chooseImage) let options:[String : AnyObject] = [CIDetectorImageOrientation:1] //圖片方向 let filters = inputImage!.autoAdjustmentFiltersWithOptions(options) //遍曆所有濾鏡,依次處理映像 for filter: CIFilter in filters { filter.setValue(inputImage, forKey: kCIInputImageKey) inputImage = filter.outputImage } let cgImage = context.createCGImage(inputImage!, fromRect: inputImage!.extent) self.imageView.image = UIImage(CGImage: cgImage) } //選取圖片 @IBAction func chooseImage(sender: UIButton) { if UIImagePickerController.isSourceTypeAvailable(.PhotoLibrary){ //初始化圖片控制器 let picker = UIImagePickerController() //設定代理 picker.delegate = self //指定圖片控制器類型 source我這裡寫的是用拍照,如果想用圖庫後面值改成UIImagePickerControllerSourceType.PhotoLibrary即可 picker.sourceType = UIImagePickerControllerSourceType.Camera //如果有自拍則調用自拍 if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front){ picker.cameraDevice = UIImagePickerControllerCameraDevice.Front } //彈出控制器,顯示介面 self.presentViewController(picker, animated: true, completion: { () -> Void in }) }else{ print("讀取相簿錯誤") } } //還原圖片 @IBAction func resetImage(sender: UIButton) { self.imageView.image = self.chooseImage } //代理 //選擇圖片成功後代理 func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { //查看info對象 print(info) //擷取選擇的原圖 let image = info[UIImagePickerControllerOriginalImage] as! UIImage self.imageView.image = image self.chooseImage = image //圖片控制器退出 picker.dismissViewControllerAnimated(true, completion: { () -> Void in }) }}
此段代碼運行效果如下: