Here is my code from Eugene's Blog(https://eugenebokhan.io/introduction-to-metal-compute-part-four) public var cgImage: CGImage? {     let bytesPerRow = self.width * 4     let length = bytesPerRow * self.height     let rgbaBytes = UnsafeMutableRawPointer.allocate(byteCount: length, alignment: MemoryLayout<UInt8>.alignment)           defer {       rgbaBytes.deallocate()     }     let destinationRegion = MTLRegion(origin: .init(x: 0, y: 0, z: 0),                      size: .init(width: self.width,                            height: self.height,                            depth: self.depth))     self.getBytes(rgbaBytes, bytesPerRow: bytesPerRow, from: destinationRegion, mipmapLevel: 0)     let colorScape = CGColorSpaceCreateDeviceRGB()     let bitmapInfo = CGBitmapInfo(rawValue: CGImageByteOrderInfo.order32Little.rawValue | CGImageAlphaInfo.premultipliedFirst.rawValue)     guard let data = CFDataCreate(nil, rgbaBytes.assumingMemoryBound(to: UInt8.self), length),        let dataProvider = CGDataProvider(data: data),        let cgImage = CGImage(width: self.width,                   height: self.height,                   bitsPerComponent: 8,                   bitsPerPixel: 32,                   bytesPerRow: bytesPerRow,                   space: colorScape,                   bitmapInfo: bitmapInfo,                   provider: dataProvider,                   decode: nil,                   shouldInterpolate: true,                   intent: .defaultIntent)     else { return nil }           return cgImage   }