private func scale(image ciImage: CIImage?, for scale: CGFloat) -> UIImage {
    guard let ciImage = ciImage else {
        return UIImage()
    }

    let image = UIImage(ciImage: ciImage)
    let size = CGSize(width: image.size.width * scale, height: image.size.height * scale)

    let renderer = UIGraphicsImageRenderer(size: size)

    return renderer.image(actions: { (context) in
        image.draw(in: CGRect(origin: .zero, size: size))
    })
}

DispatchQueue.main.async {
   image.draw(in: CGRect(origin: .zero, size: size))
}