Bitmap outputimage = new Bitmap(inputimage);

  int hpic = inputimage.Height;
  int wpic = inputimage.Width;

  for (int x = 0; x < 4; x++);
  {
       for (int y = 0; y < 3; y++)
       {
           for (int u = 0; u < wpic / 4; u++)
           {
               for (int v = 0; v < hpic / 3; v++)

           Color tempPixelRGB = inputimage.GetPixel
           (wpic / 4 * x + u, hpic / 3 * y + v);
           }
       }
  }

return outputimage;