Changing the DPI setting on photos

Hello,
How do I save or change the DPI setting from 150 to 300 on my photos.
I am a very new apple user. Finding myself asking silly questions.
Appreciate any help.
Thank you.

Hi Deels & H,
this is a very complicated subject that I even have a problem getting a grasp of. Hopefully this site will help you understand.
http://www.alpenglowimaging.com/resolution.htm
I don't know if what you are asking is really anything that can be done.
If you read the article you will see that dpi is used for scanners and printers. Digital cameras have megapixel resolutions and depending on the camera they can take photos from 150 to 300 resolution and I am not even sure if it is dpi or another wording. As you can see, I don't really grasp the whole ides, so I have to keep reading the site to understand.
It's a great site so check out the FAQ and other Articles on the site to help you.

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In this example, Image > Image Size I have unchecked resampling and set the ppi to 300. You can see how small it's going to print on paper as opposed to maybe 100 ppi. It will still retain the same pixel dimensions.
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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.
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dpi,
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Changing the DPI setting on photos

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