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It used to be the case in macOS Mojave that if one changed the Mojave.heic file in /Library/Desktop Pictures/ then it would boot into that new picture. This is documented in this thread.

10.14.2 broke this solution, forces the desert background, and does not react to changing said HEIC file.

Does anybody know how to change it in Mojave 10.14.2?

  • it wont accept yours that worked previously ? – Ruskes Dec 29 '18 at 4:26
  • No, it won't. I changed it in 10.14.1 and my login screen was a custom image named Mojave.heic. Now, the modified file remains in place, but somehow the system is not using that file anymore as the boot background image. – Dirch Frode Dec 29 '18 at 11:30
  • Is this issue due to version problems? My version is 10.14.4 I followed the explanation, but the system still forces the desert background. – 건설재료학 Jan 26 at 2:04
  • Try renaming the file. – njboot Jan 26 at 4:47
  • I did. Mojave.heic is not the original file, but a custom image I created. I renamed the old Mojave.heic to Mojave.heic.originalso that I could keep both files. In 10.14.1 this meant my Mac would boot into my custom image as described here, but since 10.14.2 it boots into the Desert image I don't like, making the previously referenced workaround void. – Dirch Frode Jan 26 at 7:30
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You can also refer this post from SilverWolf: How do I change the login screen background in macOS Mojave?

Take a look at the /Library/Caches directory.

enter image description here

You will find the file "com.apple.desktop.admin.png." I have edited my picture so the thumbnail is different. You can do the following:

  1. Back up this file as com.apple.desktop.admin.png.bak.
  2. Copy/Paste or Drag/Drop your own png as the same original name com.apple.desktop.admin.png
  3. Also ensure that the permissions are identical to the original file.
  4. (I believe) a restart is needed. Try it logging out first and checking.

The "Mohave.heic" file is located in the /Library/Desktop Pictures directory. Changing that file will edit the default background for each user but not edit the login background image.

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