title: translate gray image with emgu cv
body: <p>I am working on an Emgucv project and I have stuck at a point. I want to change the normal picture to gray picture. But I didn't. 
  first, how will I do it?
  and finally, I installed to change with <code>ımage&lt;&gt;[]</code>  array to <code>ımage&lt;&gt;</code> and string error</p>
  
  <p>thanks for now.</p>