What is a reasonable resolution and dpi/ppi to scan 35mm slides if they will only be viewed on 20″ monitor? I am currently using a flatbed scanner and would appreciate any advice you may have. I am not against purchasing a devoted 35mm slide scanner if that is the best thing to do. I have about one hundred slides I am looking to get scanned in the near future. I am not seeking perfection, but I would like the best compromise between quality and performance. Thanks.