Change the background image in Kodi v17

Hello there,

I am testing Kodi v17. In the settings there’s the option to use different images as background image. “Background 1, 2, 3 or 4” as I recall correctly.

Does anyone know, where those four pictures are saved? I’d like to change them individually.

Thanks for any help!

To answer myself:
The background images lie under /usr/share/kodi/addons/skin.osmc/extras/backgrounds