Lockscreen
First you need to create and name files in this convention (we used png files and renamed them to jpg – this somehow works)
LockScreen___2160_1440.jpg
LockScreen___1024_0768.jpg
We used the top 10 resolutions on client machines and also the Surface Pro 3 resolution
1680 x 1050
1920 x 1080
1280 x 1024
1366 x 768
1024 x 768
1600 x 900
1920 x 1200
1280 x 800
2560 x 1440
1600 x 1200
2160 x 1440
Notice each number is 4 characters.
During OSD run the following commands using a package with the images in it
xcopy /s LockScreen*.* C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-18\ReadOnly\LockScreen_Z\ /y
xcopy /s LockScreen*.* C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-18\ReadOnly\LockScreen_Y\ /y
xcopy /s LockScreen*.* C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-18\ReadOnly\LockScreen_X\ /y
The reason for copying to 3 folders is that if the resolution changes it uses the next letter (Internet told me, haven’t confirmed)
Wallpaper
Create a new package separate from the lockscreen package with the files above however with a new naming convention so the script below is happy
BackgroundDefault2160x1440.jpg
BackgroundDefault1024x768.jpg
and so on.
In your unattend.xml file Under Specialize\amd64_Microsoft-Windows-Shell-Setup_neutral\Themes
set DesktopBackground to “C:\windows\Web\Wallpaper\HappySCCM\BackgroundDefault.jpg”
changing HappySCCM to your org/theme name.
Settings for theme
In your package add the script https://send.estate/s?e=8d1b06d056fc82a
In your task sequence have 2 run commands using the package
xcopy /s *.jpg %windir%\Web\Wallpaper\HappySCCM\ /y
cscript.exe SetBackground.vbs
You can also modify the last section of the code, if the resolution doesn’t match it uses the BackgroundDefault1920x1080.jpg, rename that to an image that scales well.