> The process used a type > of overprinting - laying down more than one ink drop per location,
If true, that would be interesting. My understanding is the inks used in these types of inkjet printers can't do that, simply because the (I believe it's because they are pigmented?) inks don't mix. I know that is true with the Epson inks. Perhaps that particular printer used special inks? Perhaps at the time, this printer (HP PhotoSmart) looked good, but I doubt it would hold a candle to today's technology. I also believe printer technology is independent of input PPI to the printer driver in the quality of image you will get out of it. That's not to say that different printer technologies don't give different levels of quality output, but that 100 ppi to any technology isn't going to give a very good 8x10...
