Why is Modified photo smaller in data size than Original after red-eye redu

I'm using iPhoto 6 and was just about to go through and delete some unnecessary originals that are taking up lots of disk space, but then I noticed, all my originals are larger in file size than the modified images (example: Original = 1.2 MB, Modified = 872 KB).
The very minor modification that I've applied in most of these is the red-eye reduction in iPhoto.
Now why would the file sizes be smaller? And is it safe then to delete the originals? Am I losing image size, quality, data? If anything, I'd expect the modified image to be larger in size, so I'm pretty confused at this point.
I really appreciate the help anyone can offer.
Quad-core 2.5 G5   Mac OS X (10.4.5)   30" Apple Cinema Display

Brian:
Any time a jpg file is edited and saved it goes thru some jpeg compression, often very minimal. Redeye removal removes some color data and thus reduces the file size. However, some edits like Retouch increased the file size since it changes and adds data to the file.
Do you Twango?

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