SafeBitmap

public static Bitmap SafeBitmap(Bitmap bmp)
        {
            //make output bmp.
            Bitmap b = new Bitmap(bmp.Width, bmp.Height);
            //get input bmp data for input and lock input bmp in memory
            BitmapData bmpD = bmp.LockBits(
                new Rectangle(0, 0, bmp.Width, bmp.Height),
                ImageLockMode.ReadOnly,
                bmp.PixelFormat);
            //get output bmp data for input and lock output bmp in memory
            BitmapData bD = b.LockBits(
                new Rectangle(0, 0, bmp.Width, bmp.Height),
                ImageLockMode.WriteOnly,
                bmp.PixelFormat);
            //make temp storage array.
            byte[] tempBytes = new byte[Math.Abs(bD.Stride) * b.Height];
            //get pointers to bitmap data.
            IntPtr ptrNew = bD.Scan0;
            IntPtr ptrOld = bmpD.Scan0;
            //copy input data to storage array.
            Marshal.Copy(ptrOld, tempBytes, 0, tempBytes.Length);
            //copy storage array to outputdata
            Marshal.Copy(tempBytes, 0, ptrNew, tempBytes.Length);
            //unlock bitmaps.
            b.UnlockBits(bD);
            bmp.UnlockBits(bmpD);
            //dispose input bitmap.
            bmp.Dispose();
            return b;
        }