C#

<br />
public static bool Invert(Bitmap b)<br />
{<br />
 System.Drawing.Imaging.BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height),<br />
 System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format24bppRgb);<br />
 int stride = bmData.Stride;<br />
 System.IntPtr Scan0 = bmData.Scan0;<br />
 unsafe<br />
 {<br />
  byte * p = (byte *)(void *)Scan0;<br />
  int nOffset = stride - b.Width*3;<br />
  int nWidth = b.Width * 3;<br />
  for(int y=0;y<b.Height;++y)<br />
  {<br />
   for(int x=0; x < nWidth; ++x )<br />
   {<br />
    p[0] = (byte)(255-p[0]);<br />
    ++p;<br />
   }<br />
   p += nOffset;<br />
  }<br />
 }<br />
 b.UnlockBits(bmData);<br />
 return true;<br />
}<br />

using System;
using System.Text;
using System.Threading;

class Program
{
    static String m2 = "Press any combination of CTL, ALT, and SHIFT modifier keys, " +
                    "and a console key.\nPress the Escape (Esc) key to quit: ";
    static String m3 = "You pressed ";
    static String m4 = " (character '{0}').";

    static StringBuilder sb = new StringBuilder();
      
                                                
    public static void Main()
    {
        bool write = false;

        Thread t1 = new Thread(new ParameterizedThreadStart(Program.Input));
        Thread t2 = new Thread(new ParameterizedThreadStart(Program.Output));

        Console.WriteLine("Thread 1 starting...");
        t1.Start(write);

        Console.WriteLine("Thread 2 starting...");
        t2.Start(write);
    }


    public static void Input(object param)
    {
        bool isWrite = (bool)param;

        ConsoleKeyInfo cki;

        //StringBuilder sb = new StringBuilder();

        Console.TreatControlCAsInput = true;

        do
        {
            Console.WriteLine(m2);
            sb.Length = 0;
            cki = Console.ReadKey(true);
            sb.Append(m3);
            if (cki.Modifiers != 0)
            {
                if ((cki.Modifiers & ConsoleModifiers.Alt) != 0)
                    sb.Append("ALT+");
                if ((cki.Modifiers & ConsoleModifiers.Shift) != 0)
                    sb.Append("SHIFT+");
                if ((cki.Modifiers & ConsoleModifiers.Control) != 0)
                    sb.Append("CTL+");
            }

            sb.Append(cki.Key.ToString());
            sb.AppendFormat(m4, cki.KeyChar);
            sb.AppendLine().AppendLine();
            Console.WriteLine(sb.ToString());
            isWrite = true;
        } while (cki.Key != ConsoleKey.Escape);

    }

    public static void Output(object param)
    {
        bool isWrite = (bool)param;
        while (isWrite)
        Console.WriteLine(sb.ToString());
    }

}