Why is iPhoto library so big? When I have only 4,000 pics, the size is over 31G!!

Is there a way to know what is taking so much space in photo library?
I have only 4,500 pictures, but Iphoto library is taking 31.5 GB.
The most part of it is from a folder called "Masters", I am not sure what's in it.
Thanks

Do you sync photos to an iPod or iPad? If so there will be a folder inside the library titled iPod Photo Cache that can grow to rather large proportions if you sync alot. That could be the reason for the undue size of your library.
Also if many of your photos are in the portrait orientation iPhoto will make a second copy of the photo, rotate it and use it as the original file. That can add to the library size.
OT

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