从CIImage创建的UIImage创建的JPG太大了3倍

import UIKit
import CoreImage

func saveCIImageAsJPG(_ ciImage: CIImage, quality: CGFloat = 0.75, completion: @escaping (URL?) -> Void) {
    let context = CIContext(options: nil)
    guard let cgImage = context.createCGImage(ciImage, from: ciImage.extent) else {
        completion(nil)
        return
    }
    
    let image = UIImage(cgImage: cgImage)
    guard let data = image.jpegData(compressionQuality: quality) else {
        completion(nil)
        return
    }
    
    let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("image.jpg")
    do {
        try data.write(to: url)
        completion(url)
    } catch {
        completion(nil)
    }
}

// 示例调用
let ciImage = // 获取你的 CIImage 对象
saveCIImageAsJPG(ciImage, quality: 0.5) { url in
    if let url = url {
        print("JPG 文件保存成功: \(url)")
    } else {
        print("JPG 文件保存失败")
    }
}