Picture jpg file size is small when using Preview?????

When I connect my camera and iphoto opens, I use it to save the photos. All fine. They go into a folder within the '2007' folder.
Then when I click to open the file using Finder, the picture is 1/4 the size of the original I was just looking at with iPhoto. ???? I can not figure out what's going on. Why is the picture with Preview so small?
Thanks a lot!!!!
AD

Allan has posted some good resources. I would add that if you have additional questions in the future it's best to post them on the iPhoto Disscussions forum rather than the OS X Tiger forum. Here's a link to the iPhoto Discussions forum:
http://discussions.apple.com/category.jspa?categoryID=143
There are a number of iPhoto experts there to field questions associated with that application.
By the way, you can learn a lot by just playing around with iPhoto. iPhoto keeps a copy of your original no matter how many times you change a photo. So, generally speaking, you don't have to worry about doing something you can't recover from. It's only when you access or change photos in the iPhoto Library folder from outside the application that you run the risk of screwing something up.
Have fun.

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