Sorry I’m late to this party.. I use Invig a lot for large signs and billboard pieces. Your best bet is to create a smallish comp (say 640 x 480) in the aspect that you’ll need it. One you get it perfect, save it. Now, make sure that you’re in Draft Mode and change the comp size the the new huge size (6400 x 4800), select the Invig layer and Command-Shift-Y to call up the Layer settings. Then select ‘Make Comp Size’ to enlarge the layer (do NOT scale the layer)… Keep it in Draft mode (because it’ll take forever to refresh) and export a frame. If you save the larger size, again, make sure you save it in Draft mode so it calls up quickly. Oh, by the way, they look GREAT in print!
Hope this helps,
kurt murphy