So I have been employed to design a large 7 ft high x 4 ft wide banner for a store window. I have never really done anything larger then a poster size....do I still need to do it at 300 ppi? That would be a huge file. It is going on some kind of sticky thing that will "stick" onto the window....I am thinking that it probably does not need to be 300 ppi. Anyone with experience in this situation have any info? thanks