Add / Remove shadow effect for Mac screenshots

First of all, you need to open Terminal:

1. Go to your Applications folder.
2. Open the Utilities folder.
3. Open the Terminal application.
4. Enter the following lines into Terminal depending on what setting you wish to change:

To remove the drop shadow effect
Enter the following line into Terminal and press Enter:
defaults write com.apple.screencapture disable-shadow -bool true

Your screen-shots should now look like this.

Apply your new settings
Enter the following line into Terminal and press Enter:
killall SystemUIServer

To restore the drop shadow effect
Enter the following line into Terminal and press Enter:
defaults delete com.apple.screencapture disable-shadow

You screenshots will look like this again.

Apply your new settings
Enter the following line into Terminal and press Enter:
killall SystemUIServer