On normal slides this is kind of tricky because slides are similar to slides in powerpoint. They cover the complete display and are normally not transparent. In my opinion there are multiple ways to implement this:
- Render your slides to a separate display. Turn the background color of all your attract slides to transparent (
background_color: 00000000). Show that display using a display widget (
https://docs.missionpinball.org/en/dev/displays/widgets/display/index.html) on top of your background image. Probably not worth the effort for a static image but maybe for animated images or videos.
- Add the image to all slides.
- Convert attract to use widgets on top of one slide which has your image in the background.
Jan