MSE calculation for grayscale images

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I have two images(original and noisy). I'm calculating PSNR. I kinda did it for color RGB images, but i don't know how to do it with grayscale. As i read, MSE calculation is different. For RGB i'm doing it like you can see in following code (I'm using Visual C#):

for (int i = 0; i < bmp1.Width; i++)
            {
                for (int j = 0; j < bmp1.Height; j++)
                {
                    mseR += Math.Pow(bmp1.GetPixel(i, j).R - bmp2.GetPixel(i, j).R, 2);
                    mseG += Math.Pow(bmp1.GetPixel(i, j).G - bmp2.GetPixel(i, j).G, 2);
                    mseB += Math.Pow(bmp1.GetPixel(i, j).B - bmp2.GetPixel(i, j).B, 2);

                }
            }
      mse = (mseR + mseG + mseB) / ((bmp1.Width * bmp1.Height) * 3);

Here I am manipulating with R,G,B of pixels.But i don't know what should i take in case of grayscale images. Can I use RGB aswell, because it actually gives some results, or i should take something else?

asked 36 secs ago

Errorfreak

22

MSE calculation for grayscale images