Converting selection borders to paths
Any selection made with a selection tool can be defined as a path.
The Make Work Path command eliminates any feathering applied to the selection. It can also alter the shape of the selection, depending on the complexity of the path and the tolerance value you choose in the Make Work Path dialog box.
To convert a selection to a path using the Make Work Path settings:
Make the selection, and click the Make Work Path button 
at the bottom of the Paths palette.
To convert a selection to a path and specify settings:
- Make the selection, and do one of the following:
- Alt-click (Windows) or Option-click (Mac OS) the Make Work Path button at the bottom of the Paths palette.
- Choose Make Work Path from the Paths palette menu.
- Enter a Tolerance value or use the default value in the Make Work Path dialog box.
- Click OK. The path appears at the bottom of the Paths palette.
Tolerance values can range from 0.5 to 10 pixels and determine how sensitive the Make Work Path command is to slight changes in the selection shape. The higher the tolerance value, the fewer the anchor points used to draw the path and the smoother the path. If the path is used as a clipping path and you have problems printing the image, use a higher tolerance value. (See Printing image clipping paths.)