title: Finding exact HSV values of colors
body: <p><img src="https://i.stack.imgur.com/voA34.jpg" alt="this is my marker"></p>
  
  <p>Using <code>cvInRangeS(hsvframe,cvScalar(90, 40, 50)</code> and <code>cvScalar(255, 90, 255),threshy)</code>,
  how can I get the exact range of values for each color (purple and yellow)?</p>