Make Dock Icons Translucent for Hidden Apps

I'm constantly hiding apps. However, OSX's dock doesn't distinguish between open apps and apps that are open but whose windows are closed. This terminal command fixes that by making hidden apps' icons translucent.

Open Terminal and copy and paste the code below.

defaults write com.apple.Dock showhidden -bool YES

The restart the dock to have it take effect.

killall Dock

That's it. Hidden apps' icons will now be translucent.