Doris if you have the same or similar software as my HP scanner try doing this or similar to make your scanner do it's scan. Set to scan and I have a small window appear. Click the Preview button and a scan is created onscreen. By default mine is set to 200% size increase but I rarely accept that but you need to scan the same picture at various settings until you are satisfied, then scan. Once you find the acceptable magnification then you can do all your scans. As I have said, I like to scan to create quite large files with the knowledge that I can downsize for any computer based use. So if you intend to do any photo editing you might be wise to scan large then downsize those you place on Facebook or the group you belong to. Also when I downsize I use 'Save as..' add a letter after the numeric name or a number after a word name so my original is not lost and both versions remain together when viewed on Windows Explorer.

Practice will let you decide as you start scanning. Try a few of your own photos so you have a basic idea before you attend the shindig. Use the auto scan and see what it does. You have an upscale scanner so output should e great. If photos are small, worn, scratched or torn then I select a higher resolution or increase the size so I can work on it later. I rarely use other scanner settings, relying on my photo editing software to do these things. I recently scanned a 1968 passport black and white photo of my wife at 600% of the original size, cleaned it up and printed it as an 8 x 10 and it came out quite good IMHO. DPI. What do you intend to do with the scans? I ask because a computer reads 72 DPI but if you intend to print then that is useless and will show jaggies so if I intend to print I select 300 DPI. Again, play a little and make your choices.

How are they being printed and ask what is the resolution of the output? This also depends on the output size. If you scan in 8.5x11 at 300 dpi and shrink the scan to half size, the resolution doubles to 600. What is this for? Brochures?

I am tossing awful photos, unwanted photos and photos of people we don't even know as I go along. Some of them aren't as damaged, as much as they are just dark and need the lighting/contrast adjusted. Husband doesn't use a computer, nor do some of the people I want to share the hard copies with. I've got loads of pictures of our group of "besties" hanging out BC (before children) and afterward, as their children were growing up. They are all grandparents now and I think they would be tickled to share the photos of "mommy/daddy when she/he was your age" with their grandkids. A lot of them aren't on the computer. I'll send them copies and keep mine on a disc. Husband loves going through the old albums, especially family hunting and camping trips with his (now deceased) father, some of the trips we have taken over the years, family weddings and get-togethers. I want to put those photos back in albums for him. I think I will scan the photos and have a professional print the ones I want hard copies of.