You can then simply run through the steps above to change the lock screen PNG file again if desired, however. This lock screen customization will persist until you change the wallpaper on the Mac through System Settings, and then it will be overwritten again by that same image.
Now when you present to the lock screen and go to login through Fast User Switching, screen saver, or the boot screen, you’ll find the new customized wallpaper on the lock screen of the Mac. Drag and drop the lockscreen.png file you created in step 2 into this folder, overwriting the existing lockscreen.png file in the process – you may need to authenticate with Touch ID or an admin login to do this. In this directory you’ll find a hexadecimal folder UUID name, something like “84C3B4814B3CA826140DB1”, open that directory and you should find a ‘lockscreen.png’ file here already. Pull down the “Go” menu and select Go To Folder, or hit Command+Shift+G to bring up Go To Folder. Pull down the File menu and choose “Export”, naming the file “lockscreen.png” and choosing PNG as the file type, and saving this lockscreen.png file somewhere obvious like the Desktop *. Locate the photo or image you want to use as the lock screen wallpaper on the Mac and open it in Preview. Want to have a different wallpaper as your lock screen wallpaper, from your desktop wallpaper? That’s pretty easy, here’s what you’ll want to do: How to Set a Different Lock Screen Wallpaper on MacOS Ventura The procedure to change the login screen wallpaper is different in MacOS Ventura, so we’re going to cover how you can customize your Mac login screen background image in Ventura 13 and newer. 
Some users may be thrilled with that level of customization alone, but it turns out you can actually set these as two different images if you’d like to. You may have noticed by now that when you change your desktop wallpaper on the Mac, the login screen wallpaper changes automatically to reflect that wallpaper too.
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