DO
Both could look OK, both could look awful, there is no way for anyone here to say. In the real world, we'd try the options and iterate on the ideas.
Chroma key will have a better quality background than a projected image, but the keying will take time and effort to get working properly. Projection, while quicker and easier could easily be hampered by other lighting.
What's to stop you from painting a background? You could paint something like the following quick knock up onto your flats and then just use a simple luma key to put graphics onto it.
http://home.vis-is.co.uk/data/grabs/sr_bg.png
With presenter + graphics
http://home.vis-is.co.uk/data/grabs/sr_bg_out.png
One question, we are split on the set design: We have three panels that are currently painted white, would it be better to have 3 hidden projectors and project onto that, or to paint it a Chroma colour and key in our backdrop?
Both could look OK, both could look awful, there is no way for anyone here to say. In the real world, we'd try the options and iterate on the ideas.
Chroma key will have a better quality background than a projected image, but the keying will take time and effort to get working properly. Projection, while quicker and easier could easily be hampered by other lighting.
What's to stop you from painting a background? You could paint something like the following quick knock up onto your flats and then just use a simple luma key to put graphics onto it.
http://home.vis-is.co.uk/data/grabs/sr_bg.png
With presenter + graphics
http://home.vis-is.co.uk/data/grabs/sr_bg_out.png