How to get difference between 2 images and save it to an image

Question

And what i mean by the title is I have 2 images - each one is from a different time ( from screen cap) i want to get the difference between the two make all the same parts

Answer 1

Here is a method that you can check two image and compare pixel to pixel

public void matchimage(System.Drawing.Bitmap img1, System.Drawing.Bitmap img2)
    {
        string img1_ref, img2_ref;
        int count1 = 0, count2 = 0;
        bool flag = true;

        if (img1.Width == img2.Width && img1.Height == img2.Height)
        {
            for (int i = 0; i < img1.Width; i++)
            {
                for (int j = 0; j < img1.Height; j++)
                {
                    img1_ref = img1.GetPixel(i, j).ToString();
                    img2_ref = img2.GetPixel(i, j).ToString();
                    if (img1_ref != img2_ref)
                    {
                        count2++;
                        flag = false;
                        break;
                    }
                    count1++;
                }

            }
            if (flag == false)
                MessageBox.Show("Sorry, Images are not same , " + count2 + " wrong pixels found");
            else
                MessageBox.Show(" Images are same , " + count1 + " same pixels found and " + count2 + " wrong pixels found");
        }
        else
            MessageBox.Show("can not compare this images");

        img1.Dispose();
        img2.Dispose();
    }