Coordinate Mismatch Problem

loaded the jpg to picture box (in Size mode as Zoomed).

I drawn a rectangle on the picture box and taken the coordinate.

opens the jpg in paint and observed the coordinate (where i drawn rectangle on the picture box). when i compare the rectangle coordinate(x and y) with paint coordinate it not the same.

I changed the Size mode to normal and observed that the coordinates are same but the Image size is too large so it display partially. so use zoom size mode property.

Say image with size 2825x3538 and keep the picture box size mode as Normal, the image shows partially in picture box. So i changed picture box mode to zoom (to fit the System screen resolution). and coordinate miss matched when compare it with Normal mode with zoom mode.

How can i achieve the same coordinates.

private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {


        OpenFD.FileName = "";
        OpenFD.Title = "open image";
        OpenFD.InitialDirectory = "C";
        OpenFD.Filter = "JPEG|*.jpg|Bmp|*.bmp|All Files|*.*.*";
        if (OpenFD.ShowDialog() == DialogResult.OK)
        {
            file = OpenFD.FileName;

            image = Image.FromFile(file);
            pictureBox1.Image = image;

             svc = Screen.PrimaryScreen;
            pictureBox1.Width = svc.Bounds.Width;
            pictureBox1.Height = svc.Bounds.Height-100;

            mybitmap1 = new Bitmap (pictureBox1.Image);
            mybitmap1.SetResolution(300, 300);
            pictureBox1.Image = mybitmap1;


        }

    }
 private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { if (mybitmap == null) { mybitmap = new Bitmap(pictureBox1.Width, pictureBox1.Height);  mybitmap.SetResolution(300, 300);  } }  
 private void pictureBox1_Paint(object sender, PaintEventArgs e) {  
 using (g = Graphics.FromImage(mybitmap)) { using (Pen pen = new Pen(Color.Green, m)) { e.Graphics.DrawRectangle(pen, r); e.Graphics.DrawString(lab[c].ToString(), new Font(lab[c].ToString(), 8F), new SolidBrush(label1.ForeColor), r); } } } 

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