I am not much of a tech on this sort of thing. But here is what works for me, I use 300 DPI for my final images. I never re sample and if I scan from negs or slides I scan at 2700 dpi, the max for my scanner, then change to 300 dpi to work with. Again with my flat bed, I will scan at a dpi that when changed to 300 gives me an image size I can work with. I have an A4 1440 printer and get very good results working like this. I think if I printed at 100 dpi the quality would not be very good, perhaps they have a wizz printer and not an ink jet? It would be interesting to know how other people work as I have 24mb single layer files which get a bit heavy when I have 8 or 10 layers on the go. :O)

Those who do not want to imitate anything, produce nothing. Salvador Dali