To enchance a selection choose from the following actions:
Selection tools options
Select any selection tool
and use the tool's options as follows:
Add To - add to existing selection border.
Subtract From - substract from existing selection border.
Move selection border
To
move a selection border choose use any one of these selection tools
and select in Tool's Options palette mode to
New.
Masks palette
Using masks is one of the best ways to improve selection quality.
Learn more...
Refine selection
Option ⌥ + Command ⌘ + R
- Use the smooth slider to create a smoother outline.
- Use the feather slider to soften the edges of a selection.
- Use the size slider to shrink or enlarge your selection edges.
Click

to reset values.