using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace Sepialise_Me
{
	public class Program
	{

		[STAThread]
		static void Main(string[] args) 
		{
            ImageAttributes attribs = new ImageAttributes();
            attribs.SetColorMatrix(SepiaMatrix());
            Image bmp = Bitmap.FromFile(args[0]);
            Bitmap bmp2 = new Bitmap(bmp.Width, bmp.Height);
            using (Graphics g = Graphics.FromImage(bmp2))
            {
                g.DrawImage(bmp, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, bmp.Width, bmp.Height, GraphicsUnit.Pixel, attribs);
            }
            bmp2.Save(Path.GetFileNameWithoutExtension(args[0]) + "_sepia.jpg", ImageFormat.Jpeg);
		}

		private static ColorMatrix SepiaMatrix()
		{
			return new ColorMatrix(
				new float[][]{
								 new float[] {0.393f, 0.349f, 0.272f, 0, 0},
								 new float[] {0.769f, 0.686f, 0.534f, 0, 0},
								 new float[] {0.189f, 0.168f, 0.131f, 0, 0},
								 new float[] {     0,      0,      0, 1, 0},
								 new float[] {     0,      0,      0, 0, 1}
							 });
		}
	}
}