Geo/Battlescape scale -> full display
I said "without reducing image size", maybe that's not very clear.I mean I was able to set a base resolution of 320x256 and get it scaled to 1280x1024, (which is x4) I don't see how to do that now...
Currently the best you can do is to set 1/3 display. You will get rid of black bands without losing a proportions. But your image will not looks like a retro big sharp pixelated image with a big sharp pixelated UI.
there IS an option for non-square pixels, that may help?