Most Online Images are 96 ppi

As I surfed the internet for images I might want to use for a book cover, I discovered that the images are in the 96 ppi mode. I guess the people who post them do that on purpose. In that mode they are OK for use as computer wallpaper and websites, but to print them out for something like a book cover they are not. For that, I've learned, you need them to be at 300 ppi.

I'm glad that it's not my job to make a book cover. Because my paintings that I've photographed and saved on my computer aren't even 96 ppi. They're 76 ppi. So that means unless there is some way to make them 300 ppi, not even my own artwork would do.

I've got to believe there is a way to make them 300 ppi. I just don't know what it is. Probably some computer geek would know. Yep, I've still a lot to learn.