Converts an image to a pdf using iTextSharp

Image2PDFConverter.cs

using iTextSharp.text;
using iTextSharp.text.pdf;

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;

namespace Image2PDF
{
    /// <summary>
    /// Converts an image to a pdf
    /// </summary>
    public class Image2PDFConverter
    {
        private const int PAGE_WIDTH = 680;
        private const int PAGE_HEIGHT = 772;

        private const double PAGE_RATIO = (double)PAGE_WIDTH / (double)PAGE_HEIGHT;

        // Page width -8px from each side //
        private const int PAGE_WIDTH_WITH_PADDING = PAGE_WIDTH - 16;

        // Page height -8px from top and bottom //
        private const int PAGE_HEIGHT_WITH_PADDING = PAGE_HEIGHT - 16;

        private string _image;

        /// <summary>
        /// Gets or sets the image to convert to a PDF
        /// </summary>
        public string Image
        {
            get
            {
                return _image;
            }
            set
            {
                if (!File.Exists(value))
                {
                    throw new FileNotFoundException("file: \"" + value + "\" was not found.");
                }

                _image = value;
            }
        }

        public string OutputPDF { get; set; }

        public bool Overwrite { get; set; }


        /// <summary>
        /// Create a PDF based on the image specified
        /// </summary>
        /// <param name="image">image to convert</param>
        public Image2PDFConverter(string image)
        {
            Image = image;
        }

        /// <summary>
        /// Create an empty object
        /// </summary>
        public Image2PDFConverter()
        {

        }

        /// <summary>
        /// Converts the image to a PDF
        /// </summary>
        /// <param name="output">File to save it to</param>
        public void Save(string output, bool overwrite = true)
        {
            if (File.Exists(output) && !overwrite)
                throw new ArgumentException("\"" + output + "\" already exists. To overwrite, set parameter \"overwrite=true\"");

            Document pdfdoc = new Document(new iTextSharp.text.Rectangle(PAGE_WIDTH, PAGE_HEIGHT), 4, 4, 4, 4);
            FileStream fileStream = new FileStream(output, FileMode.Create);

            // Creates a PDF document object in memory with the default settings //
            PdfWriter.GetInstance(pdfdoc, fileStream);

            // Convert our image to jpeg if not already //
            Bitmap image = Bitmap.FromFile(_image) as Bitmap;

            // Now we actually have some fun //
            pdfdoc.Open();
            foreach (var data in ConvertImage(image))
                pdfdoc.Add(new Jpeg(data, PAGE_WIDTH, PAGE_HEIGHT));
            pdfdoc.Close();
            fileStream.Close();
            image.Dispose();
        }

        /// <summary>
        /// Converts the image to a PDF
        /// </summary>
        /// <remarks>Make sure you set Image, Output and Overwrite to your liking</remarks>
        public void Save()
        {
            Save(OutputPDF, Overwrite);
        }

        private IEnumerable<byte[]> ConvertImage(Bitmap bitmap)
        {
            // Resize image to fit page //
            int oX = bitmap.Width;
            int oY = bitmap.Height;


            int nX = Math.Min(PAGE_WIDTH, oX);
            int nY = nX == PAGE_WIDTH ? (int)(oY * PAGE_RATIO) : oY;

            int pageCount = oY / PAGE_HEIGHT;

            // Spread images over multiple pages //
            for (int i = 0; i <= pageCount; i++)
            {
                Bitmap map = new Bitmap(nX, PAGE_HEIGHT);
                RectangleF dist = new RectangleF(0, 0, map.Width, map.Height);
                RectangleF src = new RectangleF(0, i * PAGE_HEIGHT, bitmap.Width, Math.Min(PAGE_HEIGHT, bitmap.Height - (i * PAGE_HEIGHT)));
                using (var graphics = Graphics.FromImage(map))
                    graphics.DrawImage(bitmap, dist, src, GraphicsUnit.Pixel);

                // Finally convert to jpeg //
                MemoryStream stream = new MemoryStream();
                map.Save(stream, ImageFormat.Jpeg);

                yield return stream.ToArray();
            }
        }

    }
}

program.cs

using Image2PDF;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            string imageFile = null;
            while (imageFile == null)
            {
                Console.WriteLine("Enter image to convert to PDF:");
                string file = Console.ReadLine();

                if (File.Exists(file))
                {
                    imageFile = file;
                    continue;
                }

                Console.WriteLine("File: \"" + file + "\" doesn't exist!");
                Console.WriteLine();
            }


            SaveFile(imageFile);


            Console.WriteLine("Would you like to convert another image? [y/N]");
            string isYes = Console.ReadLine().ToLower();

            if (isYes.StartsWith("y"))
            {
                Console.Clear();
                Main(args);
            }
        }

        static void SaveFile(string imageFile)
        {
            Console.WriteLine("Enter file to save PDF to:");
            string saveFile = Console.ReadLine();

            if (File.Exists(saveFile))
            {
                Console.WriteLine("File already exists");
                Console.WriteLine("Would you like to overwrite? [y/N]");
                string isYes = Console.ReadLine().ToLower();

                if (isYes.StartsWith("y"))
                {
                    Console.WriteLine("Creating PDF...");
                    Image2PDFConverter overwriteConvert = new Image2PDFConverter(imageFile);

                    Stopwatch watch = new Stopwatch();
                    watch.Start();
                    overwriteConvert.Save(saveFile);
                    watch.Stop();
                    Console.WriteLine("Completed in: " + watch.Elapsed.TotalSeconds + " seconds");
                    return;
                }
                else
                {
                    SaveFile(imageFile);
                    return;
                }
            }
            Console.WriteLine("Creating PDF...");
            Image2PDFConverter convert = new Image2PDFConverter(imageFile);

            Stopwatch watched = new Stopwatch();
            watched.Start();
            convert.Save(saveFile);
            watched.Stop();
            Console.WriteLine("Completed in: " + watched.Elapsed.TotalSeconds + " seconds");
        }

    }
}