ed. It can take 3
values:</p><dl><dt>"new":</dt>
<dd><p>a new <code><a href="Image-class.html">Image</a></code> object is created and the results
  are stored inside (the default).</p></dd>

 <dt>"self":</dt>
<dd><p>the results are stored back into <code>image</code> (faster but
  destructive).</p></dd>

 <dt>An <code><a href="Image-class.html">Image</a></code> object:</dt>
<dd><p>the results are stored in another
  existing <code><a href="Image-class.html">Image</a></code> object. This is fast and will not