keyboard.
  For more information, use <code>-help-keyset</code> to print information about this topic.
</td>
</tr>
<tr>
  <td><code>-onion &lt;image&gt;</code></td>
  <td>Use overlay image over screen.</td>
  <td>No support for JPEG. Only PNG is supported.</td></tr>
<tr>
  <td><code>-onion-alpha &lt;percent&gt;</code></td>
  <td>Specify onion skin translucency  value (as percent).
  <td>Default is 50.</td>
</tr>
<tr>
  <td><code>-onion-rotation &lt;position&gt;</code></td>
  <td>Specify onion skin rotation.