QUICK TRICK TO REAPPLY THAT FILTER

Want a convenient shortcut that lets you run the last filter you applied, without going to the Filter menu? Too bad (just kidding). Simply press Command-F (PC: Control-F). What if you don't want the same settings (ah, I knew you were going to ask that)? Try pressing Command-Option-F (PC: Control-Alt-F), which brings up the dialog for the last filter you applied with the last settings you used.