Hi @ted939, thank you.
If you take another look, you'll see that that isn't my article. My friend Christina wrote it. I love her, but she's wrong about this. Lightroom is a steaming pile of shit.
Yeah, that's what I was afraid of.
As I said, the success of restoration is entirely dependent on the quality of the scan. A normal home/office scanner doesn't cut it.
Do you know if there is a professional scanning service near where your sister lives?
It says 300ppi right there. That's what you use.
Crop your files to 5x7 inches at 300ppi, then save at level 10 quality as it says - NOT maximum.
I wouldn't use the purple flower photo, because there's too much chance that it'll be out of gamut.
Any or all of the other prints are fine.
The hell they are. NEVER send full original resolution files to print. Always crop them to the exact size and resolution you intend to print. What resolution does your lab ask for?