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My book designer is requesting “high resolution” images with at least 300 dpi. What does this mean and how do I do it?

Occasionally I work with clients who provide me with images they have scanned (old family photographs for instance), but they turn out to be poor quality due to being scanned at low resolution. Consequently I will need to request images that are higher in resolution. Many people don't understand what “high resolution” is. Nor does the term dpi as in “please provide a photo that is at least 5 x 7” at 300 dpi” mean anything. And why should it?! It's not something most of deal with day after day. So let's explore these things. Dpi means dots per inch. If you examine an image in a book with a magnifying glass you will see that it is made up of all kinds of tiny ink dots (on a computer…
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