Keyboard shortcut
L
toggle between

and

+
shift ⇧ =

+
opt ⌥ =
The Polygonal Lasso tool is useful for drawing straight-edged selections.
Select
Polygonal Lasso tool in the Tools palette.
- Click in the image to make a starting point.
- Do one or more of following:
- To draw a straight selection line, position
pointer where you want to end the line, and click.
- To erase recently drawn lines, press Backspace ←
- To close the selection border:
- Position
pointer over the starting point and click.
- Double-click.
- Press Return ↩
To temporarily switch to
Lasso tool, hold down Option ⌥
Tool Options
You can switch to
Lasso tool and use the following
Polygonal Lasso modes:
New - to draw new selection.
Add To - add to border of existing selection.
Subtract From - substract from border of existing selection.
The Polygonal Lasso tool also has an option called "Anti-alias" to smooth the edges of a selection.
Learn more about how to enhance a selection.