Screenshot formats, locations and styles are controlled by the com.apple.screencapture defaults domain. This time of the year (or OS Release Cycle) I am doing a lot of screenshots. And while I love the way they look with drop shadows, no one else does. So I find myself frequently disabling those drop shadows. To do so:
defaults write com.apple.screencapture disable-shadow -bool true
Then reboot or killall SystemUIServer:
killall SystemUIServer
To get them back:
defaults write com.apple.screencapture disable-shadow -bool false ; killall SystemUIServer
