full size images or banners

Hello.

Can anyone suggest to me how I can get a banner with text overlay similar to the “section-image” class? What I need different is I want to be able to have the image full size in the original aspect ratio and not cropped the the thin banner it provides. I want the image to stretch or shrink if need be to be full width and I want the height react accordingly.

It would also be cool if I could set the height of a banner.

The documentation says I can use the normal mechanisms to add a full-size image. However my experience is that this can have margins on the sides if the viewport is too wide. I did make sure that the image was not added into some kind of container.

thanks in advance,
.pat styles