Select with the magnetic lasso tool – Adobe Photoshop CS4 User Manual
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USING PHOTOSHOP CS4
Selecting and masking
Last updated 1/10/2010
Selection options
A. New B. Add To C. Subtract From D. Intersect With
3
(Optional) Set feathering and anti-aliasing in the options bar. See “
Soften the edges of selections
4
Click in the image to set the starting point.
5
Do one or more of the following:
•
To draw a straight segment, position the pointer where you want the first straight segment to end, and click.
Continue clicking to set endpoints for subsequent segments.
•
To draw a straight line at a multiple of 45°, hold down Shift as you move to click the next segment.
•
To draw a freehand segment, hold down Alt (Windows) or Option (Mac
OS), and drag. When you finish, release
Alt or Option and the mouse button.
•
To erase recently drawn straight segments, press the Delete key.
6
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).
7
(Optional) Click Refine Edge to further adjust the selection boundary or view the selection against different
backgrounds or as a mask. See “
Select with the Magnetic Lasso tool
When you use the Magnetic Lasso tool
, the border snaps to the edges of defined areas in the image. The Magnetic
Lasso tool is not available for 32-bits-per-channel images.
The Magnetic Lasso tool is especially useful for quickly selecting objects with complex edges set against high-contrast
backgrounds.
1
Select the Magnetic Lasso tool.
2
Specify one of the selection options in the options bar.
Selection options
A. New B. Add To C. Subtract From D. Intersect With
3
(Optional) Set feathering and anti-aliasing in the options bar. See “
Soften the edges of selections
4
Set any of these options:
Width
To specify a detection width, enter a pixel value for Width. The Magnetic Lasso tool detects edges only within
the specified distance from the pointer.
A
B
C
D
A
B
C
D