| Keyboard Shortcut | Menu Shortcut | Menu Location |
| Shift+P | Alt+S, P | Selection -> Polygon Select |
The Polygon Select command selects a polygonal region of the image in Image Display Mode.
Activate the Polygon Select command, click the left mouse button to start the polygon. Add more segments to the polygon fence by clicking to set additional points. Double-click on the last point to close the polygon.
To add more area to the existing selection, hold down the Shift key while selecting a region.
To remove area from an existing selection, hold down the Alt key while selecting a region.
To clear the selection, press Esc.