How Do Pixels and DPI and Resolution and Picture Size and File Size All Relate?

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Please explain the relationship between bytes (resolution), pixels (understood as size), and dpi (e.g. 300 dpi resolution for printing purposes). I need to explain to colleagues at work why their reports uploaded to our website take so long to download – because they are too big and contain many high res photographs and pdfs!

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.

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