Solution for changing Big Sur login wallpaper to custom.

Just sharing a solution I've found on Stack Exchange. Credit to whoever discovered it.


  1. System Preferences > Users & Groups.
  2. Open lock to make changes.
  3. Right click on user in left column > Advanced Options.
  4. Copy UUID value.
  5. Go to /Library/Caches/Desktop Pictures.
  6. If it doesn't exist create Desktop Pictures folder.
  7. Inside Desktop Pictures create folder with UUID value as name.
  8. Right click on folder > Get Info.
  9. Open lock to make changes.
  10. Grant permission to Read & Write to user, admin, everyone.
  11. Make sure FileVault and Guest user are deactivated.
  12. Change desktop wallpaper.
  13. Restart computer.


Big Sur will now always create a lockscreen.png file in the UUID folder matching the current wallpaper.


Tested on a 2018 MBP and works perfectly.


Enjoy!

MacBook Pro 15″, macOS 11.0

Posted on Nov 17, 2020 1:46 PM

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Posted on Jan 12, 2021 10:13 AM

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490 replies

Jun 12, 2021 6:30 PM in response to LeadMare

LeadMare wrote:


… The hideous purple mountains majesty (not!) doesn't even begin to suggest the geography of Monterrey (where I have spent much time). …

I believe the Monterrey graphic is an «impressionistic representation of the» underwater «geography of Monterrey».


(The way it was presented at WWDC helped give me that impression.)

Jun 13, 2021 8:35 AM in response to Wengro

Wengro wrote:

I don’t mind the [Big Sur] image or the forthcoming Monterey one as OPTIONS, but making them an unchangeable default (without annoying and insecure work-arounds) Login Screen/Lock Screen background is just NOT cool!

I agree that built-in, secure means for changing the Login Screen background should be provided by Apple. (The Lock Screen background usually seems to properly change with the individual user’s choice of Background.)


However, no amount of discussion, here, will be able to change anything along such lines.


The only recourse is to provide Apple direct Feedback, through their designated mechanisms, such as Product Feedback - Apple.

Jun 14, 2021 6:30 AM in response to emd203

emd203 wrote:

I did this - it works for the lock screen when the computer logs out but it doesn't change anything for the start-up lock screen (absolutely hideous - what were they thinking?). Hope there's someone who has a solution or at least that input like this kick start a solution for the designers of the Big Sur operating system upgrade.

See my comment, above, at https://discussions.apple.com/thread/252056512?answerId=255381017022#255381017022.

Jun 14, 2021 7:26 PM in response to LeadMare

LeadMare wrote:

A kelp forest isn't a field of "distracting details." The fronds lend themselves to an impressionistic representation that would make a nice login screen, e.g., from this image (from the Farallon islands, just north of Monterrey)

Yes. One could, most certainly, create «an impressionistic representation» of a «kelp forest», but such would not, necessarily, be a reasonable «impressionistic representation» of Monterrey, per se (even according to your own choice of image).


Since it is Apple’s choice of name—even as a location—it is Apple’s choice of what «impressionistic representation» they wish to use.


In any case, the underwater canyon view, they appear to have chosen, is, arguably, far cleaner—fewer lines—than any including a «kelp forest».


If you want anything different, then the only recourse is to provide Apple direct Feedback, through their designated mechanisms, such as Product Feedback - Apple.

Oct 15, 2021 4:45 PM in response to Halliday

Display name and password for a single user does not show that eye boggling colour. I have a photo of my own choosing both as log in and as desk top as a single user. Where it needs a swerve to get round it is multiple users on the same Mac. Took me a while to figure that it pertained to multiple users. Don't understand why Apple made it so that it is so difficult to get rid it - its so annoying. You have no idea the relief of getting rid of it. Not only that its like Apple removing our freedom of choice on a Mac we bought and paid for.

Oct 15, 2021 10:49 PM in response to glenidol

Please. Do tell, glenidol.


We have been seeing cases of Single User systems where, using “Display login window as: Name and password” always displays the Big Sur Graphic image («that eye boggling colour», as you put it). Yet, once changed to “Display login window as: List of Users”, that would be skipped for the Lock Screen.


However, I’m not certain that that has remained the case with the most recent updates.

Oct 17, 2021 12:39 PM in response to glenidol

glenidol:


In your post (Oct 15, 2021 6:45 PM in response to Halliday), you claimed: «Display name and password for a single user does not show that eye boggling colour.»


You now seem to be confirming what I wrote in response to your comment, then:

«We have been seeing cases of Single User systems where, using “Display login window as: Name and password” always displays the Big Sur Graphic image («that eye boggling colour», as you put it). Yet, once changed to “Display login window as: List of Users”, that would be skipped for the Lock Screen.»


(This was why I wrote my comment, Oct 15, 2021 2:58 PM in response to EdFladung3, just above the first comment you wrote to me, on this page.)


Is this all correct?

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Solution for changing Big Sur login wallpaper to custom.

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