Function to write image directly to URL

Outputter.swift

import Foundation
import UIKit
import CoreImage
import Metal

class Outputter {
    
    private lazy var context: CIContext = {
        guard
            let device = MTLCreateSystemDefaultDevice(),
            let queue = device.makeCommandQueue()
        else {
            print("WARNING: Using CPU-backed context. This is going to be very slow.")
            return CIContext()
        }
        return CIContext(mtlCommandQueue: queue)
    }()
    
    func saveImageToTemporaryDirectory(_ image: UIImage, originalSize: CGSize, originalFileExtension: String?) -> URL? {
        
        let fileExtension = originalFileExtension ?? "png" // Default to "png" if nil
        let fileName = UUID().uuidString + "." + fileExtension
        let fileURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(fileName)
        
        guard let ciImage = CIImage(image: image) else {
            return nil
        }
        
        print("originalSize:", originalSize)
        print("Start extent:", ciImage.extent)
        
        // Apply color adjustments here.
        
        print("End extent:", ciImage.extent)
        
        let outputImage = ciImage.cropped(to: CGRect(origin: .zero, size: originalSize))
        let colorSpace = outputImage.colorSpace ?? CGColorSpaceCreateDeviceRGB()
        
        do {
            if ["jpg", "jpeg"].contains(fileExtension.lowercased()) {
                try context.writeJPEGRepresentation(of: outputImage, to: fileURL, colorSpace: colorSpace)
            } else {
                try context.writePNGRepresentation(of: outputImage, to: fileURL, format: .RGBA8, colorSpace: colorSpace)
            }
        } catch {
            print("Export failed:", error)
        }
    }
}