↓こんな感じが良さそうです。
import UIKit import AVFoundation import EasyCamery import EasyImagy class ViewController: UIViewController { @IBOutlet var imageView: UIImageView! private let camera: Camera<RGBA<UInt8>> = try! Camera(sessionPreset: .vga640x480, focusMode: .continuousAutoFocus) override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) camera.start { [weak self] image in // Makes `image` negative image.update { pixel in pixel.red = 255 - pixel.red pixel.green = 255 - pixel.green pixel.blue = 255 - pixel.blue } self?.imageView.image = image.uiImage(orientedTo: UIApplication.shared.cameraOrientation) } } override func viewWillDisappear(_ animated: Bool) { camera.stop() super.viewWillDisappear(animated) } } extension Image where Pixel == RGBA<UInt8> { func uiImage(orientedTo orientation: UIImageOrientation) -> UIImage { return UIImage(cgImage: cgImage, scale: 1.0, orientation: orientation) } } extension UIApplication { var cameraOrientation: UIImageOrientation { switch statusBarOrientation { case .portrait: return .right case .landscapeRight: return .up case .portraitUpsideDown: return .left case .landscapeLeft: return .down case .unknown: return .right } } }
(edited)