It can be very confusing.
Understanding some of the details about how photographs are stored on disk, how they are displayed, and how they are printed, can allow you to make a dramatic difference in the size of documents, web pages, emails, and more.
The details aren’t horrific but they can be a little confusing if a couple of fundamentals are skipped, especially because there are two different types of “size.”
So, I’ll start with the fundamentals.
It all starts with pixels.