Where is wallpaper stored on iPhone?

[6mossop8]

they're stored in

\HomeDomain\Library\Springboard\


You'll need a browser to find them & then note that they are .cpbitmat files and need converting.
That said there is a thumbnail for both lock and background wallpapers

 

[Raz0rEdge]

Jake, if you're still interested in doing this, here are the steps.

1. Perform iOS device backup using Itunes without encryption enabled or other compatible software.
2. Extracted backup content using imobax in a directory or other software.
3. Locate /HomeDomain/Library/SpringBoard/ directory in the extracted backup direcrory and copy OriginalHomeBackground.cpbitmap, HomeBackground.cpbitmap and LockBackground.cpbitmap files.

cpbitmap-to-png OriginalHomeBackground.cpbitmap home-original.png
cpbitmap-to-png HomeBackground.cpbitmap home.png
cpbitmap-to-png LockBackground.cpbitmap lock.png

Reference: GitHub - hthetiot/cpbitmap-to-png: Convert cpbitmap file to png

 

[MacInWin]

The thread is four years old. But thanks for commenting.