Background Colour Filter

Would it be possible to add a colour filter to backgrounds? There are some options like play speed, etc. but the ability to add a colour filter or semi transparent solid colour would add a lot of flexibility to background images/video loops. Essentially one background could become several just by changing the dominant colour. It would provide a lot of versatility.

Yes, I was recently wanting to make a background image darker by either making it more black, or by reducing transparency, but was surprised to find that there's no way to do this within Presenter. So I second this request.