title: Swing: How to read graphic information underneath a component?
body: <p>How could I "read" graphic information <strong>underneath a component</strong>
  (let's say as <strong>BufferedImage</strong>)?  </p>
  
  <p>I want to make that component half-translucent (already done)
  and apply graphic effects on underlying stuff, such as blur all
  elements under that component (<strong>but not the component itself</strong>).</p>
  
  <p>My approach is probable wrong:<br>
  I try to get graphic information from Graphics2D instance given to me
  in the <strong>paint(...)</strong> method, but it's empty, right?</p>