C# หาค่าสีที่เมาส์ชี้ เจอ Error Parameter must be positive and < Width. Parameter name: x แก้ยังไง

public void pictureEdit1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e )
{
 GT_Color(cursor.X, cursor.Y);
}

public void GT_Color(int xx , int yy)
        {
            try
            {
                Bitmap b = new Bitmap(pictureEdit1.Image);
                
                    System.Drawing.Color CCC = b.GetPixel(xx, yy);
                    BB.Text = " | " + CCC.R.ToString() + ", " + CCC.G.ToString() + ", " + CCC.B.ToString() + " | ";
                    rr = int.Parse(CCC.R.ToString());
                    gg = int.Parse(CCC.G.ToString());
                    bb = int.Parse(CCC.B.ToString());
                    BB.BackColor = System.Drawing.Color.FromArgb(rr, gg, bb);
                
            }
            catch (InvalidCastException e)
            {

            }
           
                

        }