I'm working on backgrounds and foregrounds for a game and I would want these to be 1920x1080 which is not the power of two. I have tried 2560x1024 and then slicing it into 512x512 parts to support older graphics cards.
This works fine and all but I would to keep them in 16:9 aspect ratio. What would be the best way to approach this problem, and how important is the power of two?