How do you change the dpi on photos?

I am writing a book and inserting old photos into it.   These photos were scanned by people and sent by e-mail.   I need to change the dpi on the photos to 300 dpi for printing purposes.   I have just bought Lightroom, so I don't know a lot yet.   But, my first project is changing the dpi of these photos and inserting them into my book.   Thank you.

victoriafinland wrote:
I am writing a book and inserting old photos into it.   These photos were scanned by people and sent by e-mail.   I need to change the dpi on the photos to 300 dpi for printing purposes.
Actually, you don't need to change the resolution (which is PPI, not DPI), and anyway, you can't do this unnecessary thing in Lightroom. You do need to have enough pixels in the image to print at the desired size. So, for example, if the book calls for a 4x6 space to be filled with your photo, then you would need a photo that is 1200x1800 pixels (or larger). If your book requires the photos outside of Lightroom, then you would Export the photo (if necessary, enlarged) to the desired number of pixels, as in the example.
I have just bought Lightroom, so I don't know a lot yet.   But, my first project is changing the dpi of these photos and inserting them into my book.
So based on the fact that this is an unnecessary task, and that Lightroom won't do this anyway, your first project is now completed.

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