Deleting images but IPhoto size stays same?

I removed about 1500 photos from iPhoto but the size of the iphoto library didn't change a bit, still at 30GB.

Did you remember to empty the iPhoto Trash after you deleted the photos? The photos will stay in the library, until you trash them. Ctrl-click the iPhoto Trash item in the sidebar to empty the trash.

How did you delete them and from where, an event or album?

Deleting Photos from an iPhoto Library

1 - from an Event or the Photos mode: select the photo(s) and use the Delete key to move the photos to the trash bin. Then empty the iPhoto Trash bin as follows:

2 - from an album, smart album, book, slideshow, card, etc.: select the photo(s) and use the key combination of Command+Option+Delete to move the photos to the trash bin. Then empty the trash bin as above.

NOTE: deleting a photo from an album, slideshow, book, etc., with only the Delete key only deletes that photo from that item. Deleting a photo from an Event deletes ALL occurences of that photo in the library.

OT