Adobe photoshop cs2 사용자 설명서
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ADOBE PHOTOSHOP CS2
User Guide
Photoshop or ImageReady checks around each selected pixel to find any unselected pixels falling within the specified
range. For example, if you enter 16 for the sample radius, the program uses each pixel as the center of a 33-by-33-
pixel area (16 pixels in the horizontal and vertical directions). If most pixels in the range are selected, any unselected
pixels are added to the selection. If most pixels are unselected, any selected pixels are removed from the selection.
range. For example, if you enter 16 for the sample radius, the program uses each pixel as the center of a 33-by-33-
pixel area (16 pixels in the horizontal and vertical directions). If most pixels in the range are selected, any unselected
pixels are added to the selection. If most pixels are unselected, any selected pixels are removed from the selection.
Note: The relationship between physical distance and pixel distance depends on the resolution of the image. For example,
5 pixels is a longer distance in a 72-ppi image than in a 300-ppi image.
5 pixels is a longer distance in a 72-ppi image than in a 300-ppi image.
See also
Softening and refining the edges of selections
Methods for softening the edges of a selection
You can smooth the hard edges of a selection by anti-aliasing and by feathering.
Anti-aliasing
Smooths the jagged edges of a selection by softening the color transition between edge pixels and
background pixels. Because only the edge pixels change, no detail is lost. Anti-aliasing is useful when cutting,
copying, and pasting selections to create composite images.
copying, and pasting selections to create composite images.
Anti-aliasing is available for the Lasso tool, the Polygonal Lasso tool, the Magnetic Lasso tool, the Rounded Rectangle
Marquee tool (ImageReady), the Elliptical Marquee tool, and the Magic Wand tool. (Select a tool to display its
options bar.) You must specify this option before using these tools. After a selection is made, you cannot add anti
aliasing.
Marquee tool (ImageReady), the Elliptical Marquee tool, and the Magic Wand tool. (Select a tool to display its
options bar.) You must specify this option before using these tools. After a selection is made, you cannot add anti
aliasing.
Feathering
Blurs edges by building a transition boundary between the selection and its surrounding pixels. This
blurring can cause some loss of detail at the edge of the selection.
You can define feathering for the Marquee tool, the Lasso tool, the Polygonal Lasso tool, or the Magnetic Lasso tool
as you use the tool, or you can add feathering to an existing selection. Feathering effects become apparent when you
move, cut, copy, or fill the selection.
as you use the tool, or you can add feathering to an existing selection. Feathering effects become apparent when you
move, cut, copy, or fill the selection.
To use anti-aliasing
1
Select the Lasso tool, the Polygonal Lasso tool, the Magnetic Lasso tool, the Rounded Rectangle Marquee tool
(ImageReady), the Elliptical Marquee tool, or the Magic Wand tool.
2
Select Anti-aliased in the options bar.
To define a feathered edge for a selection tool
1
Select any of the lasso or marquee tools.
2
Enter a Feather value in the options bar. This value defines the width of the feathered edge and can range from 0
to 250 pixels.
To define a feathered edge for an existing selection
1
Choose Select > Feather.
2
Enter a value for the Feather Radius, and click OK.