Обнови данный код так, чтобы при открытии изображения оно появлялось в  pictureBox1, а обработанное в pictureBox2.
После обработки, оба изображения должны храниться в progressListBox.
По нажатию на один из объектов progressListBox, изображения хранящиеся в нём, должны отображаться в соответствующих pictureBox.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using System.Diagnostics;
using SelectionSections;
using System.Net.NetworkInformation;

namespace ImageEditing
{
    public partial class Form1 : Form
    {
        private List<BackgroundWorker> workers = new List<BackgroundWorker>();

        public Form1()
        {
            InitializeComponent();
            openFileDialog.Filter = "PNG Изображения (*.png)|*.png|Все файлы(*.*)|*.*";
            saveFileDialog.Filter = "PNG Изображения (*.png)|*.png|Все файлы(*.*)|*.*";
        }

        private void openButton_Click(object sender, EventArgs e)
        {
            if (openFileDialog.ShowDialog() == DialogResult.Cancel)
                return;

            for (int i = 0; i < 10; i++)
            {
                if (workers.Count < 10)
                {
                    BackgroundWorker worker = new BackgroundWorker();
                    worker.WorkerReportsProgress = true;
                    worker.DoWork += Worker_DoWork;
                    worker.ProgressChanged += Worker_ProgressChanged;
                    worker.RunWorkerCompleted += Worker_RunWorkerCompleted;
                    workers.Add(worker);
                }
            }

            int n = 0;

            foreach (BackgroundWorker worker in workers)
            {
                if (worker.IsBusy)
                    continue;

                if (n < openFileDialog.FileNames.Length)
                {
                    // Load the image and add the filename to the list of arguments
                    Bitmap image = new Bitmap(openFileDialog.FileNames[n]);
                    List<object> arguments = new List<object> { image, openFileDialog.FileNames[n] };

                    worker.RunWorkerAsync(arguments);
                    n++;
                }
                else
                {
                    break;
                }
            }
        }

        // Worker’s DoWork event
        private void Worker_DoWork(object sender, DoWorkEventArgs e)
        {
            List<object> arguments = (List<object>)e.Argument;
            Bitmap image = (Bitmap)arguments[0];
            string filename = (string)arguments[1];
            int width = image.Width;
            int height = image.Height;

            ProgressDelegate progress = UpdateProgressBar;
            SortedList<string, object> parametrs = new SortedList<string, object>
            {
                { "source", (Bitmap) image },
                { "threshold", (double) 10 }
            };

            GrowSection growSection = new GrowSection();
            growSection.Init(parametrs);
            Stopwatch stopwatch = Stopwatch.StartNew();
            growSection.StartHandle(progress);
            stopwatch.Stop();

            // Store the output image and processing time
            e.Result = new List<object> { growSection.Result, filename, width, height, stopwatch.ElapsedMilliseconds };
        }

        // Worker’s ProgressChanged event
        private void Worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // Update the progress bar with the progress received from the worker
            if (sectionProgressBar.InvokeRequired)
            {
                sectionProgressBar.BeginInvoke(new Action(() => { sectionProgressBar.Value = e.ProgressPercentage; }));
            }
            else
            {
                sectionProgressBar.Value = e.ProgressPercentage;
            }
        }

        // Worker’s RunWorkerCompleted event
        private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            List<object> results = (List<object>)e.Result;
            Bitmap outputImage = (Bitmap)results[0];
            string filename = (string)results[1];
            int width = (int)results[2];
            int height = (int)results[3];
            long processingTime = (long)results[4];

            // Save the output image
            string outputFilename = Path.GetFileNameWithoutExtension(filename) + "_processed.png";
            outputImage.Save(outputFilename);

            // Display the progress info
            progressListBox.Items.Add($"{filename }{ width} { height} { processingTime} ms");

            // Remove the worker from the workers list
            BackgroundWorker worker = (BackgroundWorker)sender;
            workers.Remove(worker);
        }

        private void saveButton_Click(object sender, EventArgs e)
        {
            // Save functionality is already implemented in the RunWorkerCompleted event
        }

        private void UpdateProgressBar(double percent)
        {
            if (sectionProgressBar.InvokeRequired)
            {
                sectionProgressBar.BeginInvoke(new Action(() => { sectionProgressBar.Value = (int)System.Math.Round((decimal)percent); }));
            }
            else
            {
                sectionProgressBar.Value = (int)System.Math.Round((decimal)percent);
            }
        }
    }
}