Photo Info Pixel Size vs. Size of Photo Stored in Library in iPhoto 5.0?

Bear with me as I'm a new iPhoto user (also new Mac user)--but I've noticed the following. I take digital photos at 5MB and up. When I import these photos into iPhoto 5.0 and then check the "Info" on them, they display the correct number of pixels (approximating 5MB)--but the size of the file stored is only 1.0 to 1.7 MB (??) Does the Mac do an automatic compression of some kind purely for storage purposes? If so, when I archive these photos to CD/DVD, is the compressed version stored or the full file? If compressed, when does the Mac uncompress the file? Can I control this compression process (disable it, whatever)?? Appreciate anyone's help in clarifying. Thanks!

Brad,
Welcome to the Apple Discussions.
I believe your camera takes digital photos at 5 MP (megapixels), not MB (megabytes). If the pixel info is correct, and when you multiply width by height you get about 5 million, then everything is fine. When I set my camera to the least amount of compression my 7.1 megapixel images range in size from 2.6 MB to 3.2 MB. Previously when I used slightly more compression in the camera, my images were sized from 1.4 MB to 2.5 MB. I think your numbers sound reasonable. Check your camera settings to see that you are using the "finest" compression setting it offers.
iPhoto does not compress your photos. One of its core philosophies is to preserve the image in the same condition as when you imported it.
How you archive your photos depends on how you wish to use the archive. If you want to preserve the iPhoto metadata, then use Share> Burn from inside iPhoto to save a version that can be read by iPhoto. If all you want archived is a list of image files, to be used on any computer, (no iPhoto metadata) then you select your pictures and Export to a desktop folder, which you then burn in the Finder. You will have options in the export dialog; you can have the full-sized images or downsize them during the export process.

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Photo Info Pixel Size vs. Size of Photo Stored in Library in iPhoto 5.0?

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