title: Order of cvScalar
body: <p>My Img in an IplImage*</p>
  
  <p>Do you confirm that the right order of what is follow:</p>
  
  <ul>
  <li>x and y: x for the width and y for the height of the image?</li>
  <li><p>B, G and R : the order of OpenCV in colors?</p>
  
  <pre><code>CvScalar scal = cvGet2D(img, x, y);
  blue_lum=scal.val[0];
  green_lum=scal.val[1];
  red_lum=scal.val[2];
  </code></pre></li>
  <li>The order of a 3Channel image? Channel 1 is B and Channel 3 is R ?</li>
  </ul>