title: What is the Vec3b type?
body: <p>I came across the type <code>Vec3b</code> in <code>OpenCV</code>. I just couldn't find a description if this type and why we use it.</p>
  
  <p>Do you know of any reference that describes such type, or, if you can clarify it this would be very much appreciated.</p>
  
  <p>Thanks.</p>