Fixing greyed out Dock icons

From http://www.tuaw.com/2008/08/22/terminal-tips-make-hidden-dock-icons-transparent/ :-

Got icons annoyingly greyed out on your Dock after an OS reinstall/upgrade? Here’s the fix.

  1. Open the Terminal.app under Applications > Utilities. Then issue this command:
    defaults write com.apple.Dock showhidden -bool NO
  2. Next, issue this command:-
    killall Dock
    Your Dock should then relaunch exactly how you like it.
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