Use the Recover Anti-alias command when you want to restore the original anti-aliasing of an object that was pasted into an image. This command is useful if you made the selection without anti-aliasing, and now want the edges of the selection to be smooth.
To recover the anti-alias:
Choose Selections > Modify > Recover Anti-alias to open the Recover Anti-alias dialog. the selection with the anti-alias added in the right preview window.
To apply the anti-alias to all layers of the selection, mark the Sample merged check box.
To apply the anti-alias and copy the result to a new layer mark the Result on new layer check box.
For the Anti-alias mark an option:
Inside to anti-alias the inside of the selection marquee.
Outside to anti-alias outside of the selection marquee.
Click OK to anti-alias the selection edges.
Adding or Removing a Color from a Selection
Changing the Feathering of a Selection
Cleaning up the Edges of a Selection
Modifying the Select Selection Borders
Removing Specks and Holes from a Selection
Smoothing the Boundary of a Selection