If you’ve ever wanted to slightly expand the size of a selection in Photoshop, you may have experienced this frustration. When you choose Select > Modify > Expand, Photoshop expands the size of your selected area — but it rounds the corners in the process.
Next time, choose Select > Transform Selection instead. Photoshop’s traditional transform box appears around your selection. Drag a corner to resize it, or type new values into the Options Bar. Ta-da. An enlarged selection, with square corners!
Source: This tidbit found in the July 2008 issue of Design Tools Monthly. Seattle creative teams with a Creativetechs support plan receive a complimentary subscription to Design Tools Monthly in their monthly care package.