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Part 3. Selection Techniques > Task 2 How to Use the Polygonal Lasso Tool

Task 2 How to Use the Polygonal Lasso Tool

The Polygonal Lasso tool lets you make selections with straight-line segments so you can create complex geometric areas such as star bursts and objects in perspective. It does not let you create curved segments, however, so be sure the area you want to select is suited for this tool.

1. Open the File

Select File, Open and select the desired file, or click the Go to Bridge icon in the Options bar to open Bridge and then double-click the desired image thumbnail to launch the image.

2. Select the Polygonal Lasso Tool

Click and hold the Lasso tool in the toolbox and drag to select the Polygonal Lasso tool from the pop-out menu that appears. Note that the selected tool now appears on the toolbox button and in the Options bar at the top of the screen.

3. Click the First Point

Move the pointer onto the image and click to place the first anchor point. After placing the first point, notice that a straight line extends between the anchor point and the mouse pointer. This line indicates the selection line that will be created when you click to place another anchor point.

4. Add Other Points As Needed

Click once at each location on the image, and place as many anchor points as necessary to surround the area you're selecting. Press the Esc key if you decide you need to start over.

5. Close the Selection

To define an enclosed area, you can close the selection shape by clicking back on the starting anchor point. Alternatively, you can double-click or Ctrl+click (Windows users) or +click (Mac users) to connect the current point to the starting point. When you do this, the selection process is complete.

How-To Hints

Using the Shift Key for Right Angles

Press and hold the Shift key to constrain the line segments you draw with the Polygonal Lasso tool to increments of 45° angles.

For Organic Selections

Select the Lasso tool instead of the Polygonal Lasso tool to draw freeform shape selections. You can switch to the Lasso tool from the Polygonal Lasso tool on-the-fly by pressing and holding the Alt key (Windows users) or the Option key (Mac users) as you drag freeform shapes. Release the Option/Alt key to go back to dragging straight lines.

A Geometric Alternative

If you want a little help with geometric selections, try the Magnetic Lasso tool, found in the pop-out menu of the Lasso tool in the toolbox. Click and drag the tool around the selection area—the selection snaps to the nearest contrast edge. The settings in the Options bar allow you to control the snap-to qualities of the tool, which you can adjust as necessary.

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