The answers are nearly all variable. The D&H image was a print, scanned on an HP All-In-One (the sort of thing you pick up for $100 at Office Depot). The CNJ images were 35mm negatives scanned on a Minolta Dimage Scan Disk III, dedicated film and negative scanner. When I have the negative or slide, I get far better results with the Dimage Scan III than I get with prints on the HP flatbed, but on occasion I can even pull something that I think is good enough from the flatbed.

A lot of my dad's really early stuff (1940s) are on 620 negatives, which I can scan on the flatbed and get a nice image out of. Sadly, he switched to a half/frame 127 camera at some point, and those negatives are essentailly useless (too small for the flatbed and too grainy, too big to fit in the dedicated scanner).

I use a PC and scan with the software that came with each scanner. I then use Microsoft Picture It (which now has a new name). This is MS's answer to PhotoShop... not quite as good a program, but I've gotten use to it, so I use it. Almost all of these require some work, and some require a lot of work.