Why does iPhoto only import digital photo files at one-half or less of the original jpg file size?

My 24" 2008 iMac, running 10.5.8 and iPhoto '08 (300 GB harddrive, 67 GB avail, 2.8 GHz Intel Core 2 Duo, 2 GB 800 MH sdram), only imports my digital photo images directly from the camera at about 1/2 or less of the original file size.  I thought it might be my 12.2 mgp. Samsung camera, until I just a 14 mpg. Lumix, and its doing the same thing.  A 5 mg. images imports at around 2.4 mgs...  a 14 mg image imports under 6...    Its always done this, but until I bought the new camera, I assumed it was my peripheral issue.

Hi, I wonder if it's just maybe compressing them, highlight one in iPhoto & click on the little i icon for info, what is the size in Pixels compared to the original?

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