The suggestion I was referring to is not Foundry but rather the RW 7 baked in header banner tool in the General Setting on themes that support it like your Voyager and Voyager Pro.
Gotcha. Since Foundry doesn't use the drag-and-drop banner setup of RW 7 for its banners, that will not apply to it.
Reina is where ei have been banging my head against the wall. I look at in image on my MacBook Pro and it looks perfect. Pop it in a RW project and throw it up on on Acer 27" monitor or even my iMac, and as it expands it gets really soft and out of focus. Ug.
Retina is tricky. Really. For it to look good on both your image will need to be 2x in size. You'd figure out the space you need to cover on the standard display, then double it. The original image though has to be that doubled size. You can't simply up the size of the image.
For instance -- If I have a 1,000 x 400 px banner area I need to cover, my original image needs to be 2,000 x 800 px in size. I wish RW offered some kind of support for this by itself. I've thought on good ways to do this automatically in Foundry and there's not yet a great way that is easy an approachable yet thatI've hit on.