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CHAPTER 5
142
Selecting
•
To erase recently drawn straight segments,
press the Delete key.
4
Close the selection border:
Position the polygonal lasso tool pointer over the
•
starting point (a closed circle appears next to the
pointer), and click.
If the pointer is not over the starting point,
•
double-click the polygonal lasso tool pointer,
or Ctrl-click (Windows) or Command-click
(Mac OS).
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 142.)
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.
If the border doesn't snap to the desired edge,
4
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:
If needed, select the tool.
1
In the options bar, specify whether to add a new
2
selection ( ), add to an existing selection ( ),
subtract from a selection ( ), or select an area
intersected by other selections ( ).
Specify feather and anti-aliasing options.
3
(See "Softening the edges of a selection" on
page 147.)
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