如何在Swift中对图像进行颜色倍增？

import UIKit
import CoreImage

let originalImage = UIImage(named: "image.jpg")

guard let ciImage = CIImage(image: originalImage) else { return }

let colorMultiplier = CIColor(red: 2, green: 1, blue: 1)

let colorMultiplyFilter = CIFilter(name: "CIColorMultiply")

colorMultiplyFilter?.setValue(ciImage, forKey: kCIInputImageKey)
colorMultiplyFilter?.setValue(colorMultiplier, forKey: "inputColor")

guard let outputCIImage = colorMultiplyFilter?.outputImage else { return }

let context = CIContext()

guard let outputCGImage = context.createCGImage(outputCIImage, from: outputCIImage.extent) else { return }
let outputImage = UIImage(cgImage: outputCGImage)