How to disable background blur effect on macOS Sierra login screen I've replaced /Library/Desktop Pictures/Sierra.jpg with a custom background image. Now, macOS Sierra applies the blur effect on my custom background image as well. I am looking for a reliable solution to turn it off e.g. overwriting a plist preference file or any non-hacking workaround?

How can I completely disable the login screen background blur and show a crystal clear login image?
Do this:


Go to /Library/Caches/ 
Rename the original com.apple.desktop.admin.png file to com.apple.desktop.admin1.png 
Add a new image in its place with the original com.apple.desktop.admin.png name 


This will replace the blurred original image with the new one unblurred.