Low resolution warning with 8Mpixel image?

I've finished a new large size hardcover book, and some of the full page size (landscape) images with have 8 megapixel raw files as sources have low resolution warnings - some, but not all of them. Some of the photos have been edited in photoshop, and none of these have warnings. With the unedited pics, some have warnings, some don't - there doesn't seem to be any specific reason why some of the files have warnings. I haven't tried to actually buy the book, so I don't know what will happen with ordering. But it seems 8 megapixels should be fine for a large book landscape page.

Limnidytis:
What size book and theme are you using? I'm not familiar with the RAW files but remember reading about there's a couple of files that get uploaded, the raw file and a jpg for viewing - something like that. Check and make sure it's the RAW file that's in the book and not the jpg file for viewing. Click on one of the files in the book and type Command-I to bring up the Info window for it. There you'll see the image size size in pixels and file size in KB or MB. As I said I'm not familiar with those files so may be way off on this.
As far as resolution is concerned it’s the overall pixel dimensions of the file that are important. For example a 3512 x 2338 pixel file will have a resolution of about 585 dpi for a 4 x 6 print. If you expand that to an 8 x 12 print (so we don’t have to crop) the resolution will drop to about 292.
A 3512 x 2338 file will give approximately a resolution of 275 if printed at an 8.5 x 11 size or approximately a full page photo in a large book. 275 is sufficient for that size print.
iPhoto will often report the dpi at 72 but the size it’s looking at may be somewhere around 48 inches for the larger side. This can be seen if you have an editor like Photoshop Elements where you can go in and change the dpi and pixels on a side and see how the size in inches changes.
OT

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