title: How to detect blue color object using opencv
body: <p>i'm using that <a href="http://ipr10.wikidot.com/blob-detection" rel="nofollow noreferrer">guide</a> to detect blobs of a certain color.
  On that guide, it check for orange's blob and it use this values:</p>
  
  <pre><code>int orange[3] = {200, 250, 10};
  </code></pre>
  
  <p>On the guide it says that this values represents the orange in HSV. </p>
  
  <p>I don't know how they calculate this values but i try to check for blue value converting from rgb to hsv but it doesn't work. What i have to detect is this color:</p>
  
  <p><img src="https://i.stack.imgur.com/fhSWr.png" alt="this color"></p>
  
  <p>Any ideas on how to determinate HSV values to detect colors? thanks!!</p>