Convert a path to a marquee selection
You can convert a vector shape to a bitmap
selection, and then use the bitmap tools to edit the new bitmap.
Select a path.
Select Modify > Convert Path To Marquee.
In the Convert Path To Marquee dialog box, select an Edge
setting for the marquee.
If you chose Feather in the Edge setting, specify the value
you want to use for the amount of feather.
Click OK.
Note: Converting a path to a marquee
deletes the selected path. To change this default, select Edit >
Preferences > Edit, and then deselect the Delete Paths
When Converting To Marquee setting.