i want to draw circle on a image (any format..bmp,jpeg etc)

SIR,
i am doing a application for image processing where i am comparing 2 images,,and i want to highlight the pixcles where the diffrence occours with a red colored circle..i am able to compare the images but not able to highlight it with the circle..i want the pixel which is diffrent to ve the center of the circle..

Code:

if (img1.Width == img2.Width && img1.Height == img2.Height) 
{ 
      //drawing 
      g = pictureBox1.CreateGraphics(); 
      //////g = Graphics.FromImage(pictureBox1.Image); 


      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; 
  
                        //drawing 
                        x = i; 
                        y = j; 
                        pen = new Pen(Color.Red); 
                        g.DrawEllipse(pen, x, y,100,100); 

                        //drawing 
                        MessageBox.Show("error"); 

                        break; 
                  } 
                  count1++; 
            } 
            progressBar1.Value++; 
      } 
  
      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");

this.Dispose();

 

Can you be more specific : what exactly do you mean by "not able to highlight it with the circle" ?

You have used g.DrawEllipse. Doesn't it work ??

 

actully i am able to compare the images.. but i want to display a circle around the pixel "pixel as a center"which is diffrent... i also am able to draw a circle but my problem is the pixel which is diffrent should be at the center...of the circle