title: What is the purpose of CvType.CV_8UC4
body: <p>I have a snippet code from colorblobdetection but I don't know what is the purpose of CvType.CV_8UC4. The <a href="https://stackoverflow.com/questions/13428689/whats-the-difference-between-cvtype-values-in-opencv">Link</a> here does not really explain how does it works.</p>
  
  <pre><code>public void onCameraViewStarted(int width, int height) {
      mRgba = new Mat(height, width, CvType.CV_8UC4); 
      mDetector = new ColorBlobDetector();
      mSpectrum = new Mat();
      mBlobColorRgba = new Scalar(255);
      mBlobColorHsv = new Scalar(255);
      SPECTRUM_SIZE = new Size(200, 64);
      CONTOUR_COLOR = new Scalar(255,0,0,255);
  }
  </code></pre>