Trying to export at 300dpi for photobook

I am trying to export photos out of iphoto onto my desktop to create a photobook (not an apple one). The requirement is for photos to be 300dpi. My photos are 72 dpi irrespective of exporting them at the highest quality (they were all taken with a EOS 7D camera & the actual file size ranges from 7.2MB to nearly 20MB. I dont seem to be able to resize them to 300dpi (in preview after exporting them & also trying to open them with preview in iphoto) - will it matter? Does the actual dpi size matter given the actual file size?
thanks

Short answer: the dpi is set when you decide what size you're printing at.
Long Answer: Dpi means nothing in the digital world of your computer. There are no "inches" to have "dots per..." Size is measured in pixels. That's the same on your camera. It doesn't take 10 x 8 or 6 x 4 shots. It takes shots measured in megapixels. For instance 4,000 x 3,000 is a 12 megapixel camera.
Using that example, that shot from that camera has 12 million pixels. So that's how many "Dots" there are. To decide the ratio of dots per inch, you now need to decide the "inches" part. And that's printing. Print at 10 x 8 and the dpi will be 4,000/10 or about 400 dpi. At 6 x 4 then it's 4,000/6 or 660 dpi. Work the other way: Print at 300 dpi and the resulting image will be about 13 inches on the longer side.
So, your photo as a fixed number of pixels. Changing the dimensions of the print will vary the dpi, changing the dpi will vary the dimensions of the print.
For more see http://www.rideau-info.com/photos/mythdpi.html
Regards
TD

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Trying to export at 300dpi for photobook

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