I've got an Epson film scanner, which is generally a top notch machine. I use the Epson Scan software, and again, it's given me to reason to complain...except for one. When I scan 4x5s, I'm very limited to the resolution I can choose.I think I can do 600dpi color and 1200dpi B+W. I've always assumed that this is because the computer (i.e., the scanning software) is trying to scan the entire image before it is saved. In other words, I've assumed that the weak link is the amount of RAM. On the other hand, it would take a huge amount of RAM to hold a 4x5 chrome scanned at 4800. So, is there scanning software which will progressively save the image as it's scanned. I know it would be a monster file, tough to work with, requiring immense amounts of RAM just to open, yada yada yada, but does such software exist?