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Is there a way to change the background image of the second monitor without connecting the Mac to it?

I connected my Macbook to a projector and set up a background image. Now that I disconnected the projector, is there a way to change the background image before connecting the projector again? The reason for this is simple: I need a way to define a single background image on all spaces, monitors and projectors at once so I know which background image my audience will see when I connect to a projector or change to another space. I just want one way to change all desktop backgrounds at once, even displays that are not connected. I would prefer a Terminal command so I can script this.

  • What version of OS X/macOS are you running? – user3439894 Dec 11 '17 at 11:52
  • I am using macOS 10.13.2 (High Sierra) – WalterBeiter Dec 11 '17 at 12:33

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