What you need is a 10' x 10' graphic at 72Ppi, which is 8,640 x 8,640 pixels. A standard 8x10 photo can be scanned in at 600 Ppi (if LAB printed), which enlarged gives you 4,800 x 3,600 Ppi, or mare than half of what you need. I would scan it into potoshop, accepting my scanners Srgb color...