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?

3 Answers 3


Do this:

  1. Go to /Library/Caches/
  2. Rename the original com.apple.desktop.admin.png file to com.apple.desktop.admin1.png
  3. 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.

  • 2
    yeah, this workflow applies to El Capitan and Yosemite. It doesn't work with macOS Sierra. I've replaced /Library/Caches/com.apple.desktop.admin.png. As soon as restart or logout the image is still blurred.
    – howdytom
    Nov 15, 2016 at 13:15
  • 1
    Did you rename the original file and then add a new one? Or did you just replace the original?
    – Monomeeth
    Nov 15, 2016 at 13:18
  • a) I have renamed com.apple.desktop.admin.png to com.apple.desktop.admin1.png. b) Than I copied my custom image and replace it with com.apple.desktop.admin.png. c) Logout + System reboot
    – howdytom
    Nov 15, 2016 at 13:24
  • 1
    That's interesting. I know these steps worked in macOS Sierra. I wonder if the actual image itself has an effect somehow? When I get a chance I will try a few different ones and test the results.
    – Monomeeth
    Nov 16, 2016 at 0:07
  • I'd confirm that this does in fact work with macOS Sierra, but it seems unnecessary that you suggested in your answer to create a backup of the original blurred image - you wouldn't need it again if you are replacing it anyways.
    – hpm
    Feb 3, 2018 at 12:35

Turn on "Reduce Transparency" in Accessibility and it will remove the blur effect.

enter image description here

This used to be called "Translucency" before, but for some reason they changed it to "Transparency".

I just tested it and my blurred login screen went to a simple grey screen.

  • Unfortunately "Reduce Transparency" doesn't remove the blurred background image. The Background image with our company logo is still blurred. With solid plain color backgrounds you might not see any difference.
    – howdytom
    Nov 15, 2016 at 15:04
  • I don't any have solid color backgrounds... I will look a bit more into it.
    – Allan
    Nov 15, 2016 at 15:07

i've found this somewhere :

The file in /System/Library/CoreServices/DefaultDesktop.jpg is an alias that points to /Library/Desktop Pictures/Sierra.jpg.

so i changed the picture called "Sierra.jpg" by mine & i get this picture in login window. but it still blur effect. i do not know how to remove it !

another page here, but i can not understand anything ! https://onemoreadmin.wordpress.com/2016/09/24/apples-efi-logonui-managing-macos-sierras-wallpaper/

  • Making modifications to the System folder is not recommended! As I mentioned above, replacing the desktop image is working just fine. however I would like to disable the background blur.
    – howdytom
    Nov 15, 2016 at 15:36
  • same for me,, i've just mentioned this because it could be a way of investigation...
    – steve
    Nov 16, 2016 at 13:16

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