Hey Fish_Eye (or anyone), can you help?

[addict]

Sorry to post this non-fishing question here, but I'm stumped.
If this gets deleted, I'll understand.

I've been scanning my wedding pics thru a canon scanner (N1220U) at 1200 dpi. When I am done scanning the pics (all 4x6's) the file size is a respectable 2-3 megs. Some of these pics are landscaped so I used photoshop to rotate the pics 90*. When I do that, the file size jumps to like 15 megs! Why does this happen and more importantly, is there any way of keeping the file size to the original 2-3 megs? All are saved as jpg's.

Thanks as always...