Merge multiple image with space between images and image in original size

public void MergeImages(List<Image> imageList)
{
    
    string jpg3 = "Save path";
    int heights = 0;
    int nIndex = 0;

    List<int> widths = new List<int>();
    foreach (Image image in imageList)
    {
        widths.Add(image.Width);
        heights += image.Height;


    }
    widths.Sort();
    int width = widths[widths.Count - 1];

    Bitmap img3 = new Bitmap(width, heights);
    Graphics g = Graphics.FromImage(img3);
    g.Clear(Color.White);
    foreach (Image image in imageList)
    {
        Image img = image;
        if (nIndex == 0)
        {
            g.DrawImage(img, new Point(0, 0));
            nIndex++;
            width = img.Height;
        }
        else
        {

            g.DrawImage(img, new Point(0, width));
            width += img.Height;
        }
        img3.Save(jpg3, System.Drawing.Imaging.ImageFormat.Jpeg);
        img.Dispose();
    }
    g.Dispose();
    try
    {
        img3.Save(jpg3, System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    catch (Exception ex)
    {

    }
    img3.Dispose();
}