Adobe 13101332 User Guide - Page 160

Adobe Photoshop Help Using Help | Contents | Index Selecting Back 160 To use the magnetic lasso tool (Photoshop): 1 Select the magnetic lasso tool , and select options. (See "Setting options for the lasso, polygonal lasso, and magnetic lasso tools" on page 160.) 2 Click in the image to set the first fastening point. Fastening points anchor the selection border in place. 3 To draw a freehand segment, move the pointer along the edge you want to trace. (You can also drag with the mouse button depressed.) The most recent segment of the selection border remains active. As you move the pointer, the active segment snaps to the strongest edge in the image, based on the detection Width set in the options bar. Periodically, the magnetic lasso tool adds fastening points to the selection border to anchor previous segments. 4 If the border doesn't snap to the desired edge, click once to add a fastening point manually. Continue to trace the edge, and add fastening points as needed. 5 To switch temporarily to the other lasso tools, do one of the following: • To activate the lasso tool, hold down Alt (Windows) or Option (Mac OS), and drag with the mouse button depressed. • To activate the polygonal lasso tool, hold down Alt (Windows) or Option (Mac OS), and click. 6 To erase recently drawn segments and fastening points, press the Delete key until you've erased the fastening points for the desired segment. 7 Close the selection border: • To close the border with a freehand magnetic segment, double-click, or press Enter or Return. • To close the border with a straight segment, hold down Alt (Windows) or Option (Mac OS), and double-click. • To close the border, drag back over the starting point and click. Setting options for the lasso, polygonal lasso, and magnetic lasso tools The lasso tool options let you customize how the different lasso tools detect and select edges. To set options for the lasso tools: 1 If needed, select the tool. 2 In the options bar, specify whether to add a new selection , add to an existing selection , subtract from a selection , or select an area intersected by other selections . 3 Specify feather and anti-aliasing options. (See "Softening the edges of a selection" on page 166.) 4 For the magnetic lasso tool (Photoshop), set any of these options: • To specify a detection width, enter a pixel value for Width.The magnetic lasso detects edges only within the specified distance from the pointer. Using Help | Contents | Index Back 160