<li>Right-click and and drag the mouse to draw a blue line, marking the background (Mac OS X and tablet users: use <span style="font-family: monospace;">Ctrl-click</span>).
</ol>
If auto-segmentation is turned on (<i>menu bar:</i> <img src="../icons/auto.png" title="Toggle auto segment" alt="Toggle auto segment">), the image will be segmented automatically, with the foreground brightened and
-the background darkened. If you are not happy with the segmentation, you may undo your mouse input (see next section)
+the background darkened. If you are not happy with the segmentation, you may undo your mouse input (see "Undo, Redo and Clear" below)
or add additional foreground and background lines to refine the segmentation.<br>
<br>
If you are satisfied with the segmentation, you may click the <img src="../icons/apply.png" title="Form a segment from current view" alt="Apply"> icon to "form", or permanently affix, the segment.