When you take a screenshot on Mac there’s always a shadow around the screenshot by default. Disable the shadow from the screenshot with this Terminal command. Be aware, this command only works on a Mac with macOS High Sierra or newer. Click here for the command for macOS Mojave or newer.
defaults write com.apple.screencapture disable-shadow true
To make the command take effect, you need to restart the System UI server:
killall SystemUIServer
Revert to the default setting (screenshots including shadows):
defaults write com.apple.screencapture disable-shadow false
Command+Control+Shit+4 work great for me you can select what you want now back from what I see. Maybe my eye are getting old and I am totally missing the point. But I Like this quick shortcut to capture a screen.