using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Drawing;
using System.Diagnostics;
using System.Drawing.Imaging;
using System.IO;

namespace convert
{
    class Program
    { 
        static void Main(string[] args)
        {
            if(args.Count() != 2)
            {
                Console.WriteLine("Example : convert.exe color.tif blackwhite.tif");
                Console.ReadKey();
                return;
            }

            if(File.Exists(args[0]) == false)
            {
                Console.WriteLine("File not found {0}", args[0]);
                Console.ReadKey();
                return;
            }

            try
            {
                Bitmap bmp = new Bitmap(args[0]);
                if(bmp != null)
                {
                    Bitmap greyBmp = ConvertToGrayscale(bmp);
                    greyBmp.Save(args[1]);
                    Console.WriteLine("Sucessful");
                    Console.ReadKey();
                }
            }
            catch(Exception e)
            {
                Console.WriteLine(e.Message);
                Console.ReadKey();
            }
        }

        public static Bitmap ConvertToGrayscale(Bitmap source)
        {
            Bitmap bm = new Bitmap(source.Width, source.Height);
            for (int y = 0; y < bm.Height; y++)
            {
                for (int x = 0; x < bm.Width; x++)
                {
                    Color c = source.GetPixel(x, y);
                    int luma = (int)(c.R * 0.3 + c.G * 0.59 + c.B * 0.11);
                    bm.SetPixel(x, y, Color.FromArgb(luma, luma, luma));
                }
            }
            return bm;
        }
    }
}