Puts a mask over any part of the screen that is outside of 16:9. The unmasked area includes the menu bar.
Here is a screenshot:
Option 1. Clone this repo and build and run the xcode project
Option 2. Curl the program hosted on louzell.com, and add it to your path:
In Term:
cd /usr/local/bin
curl -O https://www.louzell.com/programs/16by9
Make it executable:
chmod +x 16by9
Run it:
16by9
:: Use ctrl+c to quit
If your display is in 16:9, you won't see any green mask