c# hızlı resim işleme

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private bool CompareBitmaps(Image left, Image right) {     if (object.Equals(left, right))         return true;     if (left == null || right == null)         return false;     if (!left.Size.Equals(right.Size) || !left.PixelFormat.Equals(right.PixelFormat))         return false;       Bitmap leftBitmap = left as Bitmap;     Bitmap rightBitmap = right as Bitmap;     if (leftBitmap == null || rightBitmap == null)         return true;       #region Code taking more time for comparison       for (int col = 0; col < left.Width; col++)     {         for (int row = 0; row < left.Height; row++)         {             if (!leftBitmap.GetPixel(col, row).Equals(rightBitmap.GetPixel(col, row)))                 return false;        }     }       #endregion           return true; }

1.5MB resim 2.5 saniye


 40 ms  Bitmap.LockBits() and Bitmap.UnlockBits() 

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private bool CompareBitmaps(Image left, Image right) {     if (object.Equals(left, right))         return true;     if (left == null || right == null)         return false;     if (!left.Size.Equals(right.Size) || !left.PixelFormat.Equals(right.PixelFormat))         return false;       Bitmap leftBitmap = left as Bitmap;     Bitmap rightBitmap = right as Bitmap;     if (leftBitmap == null || rightBitmap == null)         return true;       #region Optimized code for performance       int bytes = left.Width * left.Height * (Image.GetPixelFormatSize(left.PixelFormat) / 8);       bool result = true;     byte[] b1bytes = new byte[bytes];     byte[] b2bytes = new byte[bytes];       BitmapData bmd1 = leftBitmap.LockBits(new Rectangle(0, 0, leftBitmap.Width - 1, leftBitmap.Height - 1), ImageLockMode.ReadOnly, leftBitmap.PixelFormat);     BitmapData bmd2 = rightBitmap.LockBits(new Rectangle(0, 0, rightBitmap.Width - 1, rightBitmap.Height - 1), ImageLockMode.ReadOnly, rightBitmap.PixelFormat);       Marshal.Copy(bmd1.Scan0, b1bytes, 0, bytes);     Marshal.Copy(bmd2.Scan0, b2bytes, 0, bytes);       for (int n = 0; n <= bytes - 1; n++)     {         if (b1bytes[n] != b2bytes[n])         {             result = false;             break;         }     }       leftBitmap.UnlockBits(bmd1);     rightBitmap.UnlockBits(bmd2);       #endregion       return result; }