title: How to remove white background color from Bitmap
body: <p>I want to remove the white background color in a bitmap </p>
  
  <pre><code>Bitmap capcha = new Bitmap("C:/image.jpg");
  pictureBox1.Image = capcha;
  </code></pre>
  
  <p>but I want to display in my pictureBox1 just the image without white that exists in the background </p>