How best to reduce iPhoto Library size?

1. Can I delete big HD movie files from iPhoto (that were uploaded from camera) after I have run iMovie so they are now iMovie Events, without any subsequent impact (ie, deletion of) my iMovie Events?
2. How can I find out size of iPhoto Books to see if it's worth moving them (and all those photos) to a second Library on an external drive?
I have 100GB in 15K photos & 227 movies, but Finder says iPhoto Library is 134GB. That implies that the Book Projects are big and self-contained rather than pointers, but I think I read somewhere that if I just move photos from this Library to a second Library,  it will "break" the books still left on the first Library?
A search found an old link to Old Toad's application note about duplicating/moving Libraries on web.mac.com but that's no longer available. Is there a new link?
Thanks.

1. Can I delete big HD movie files from iPhoto (that were uploaded from camera) after I have run iMovie so they are now iMovie Events, without any subsequent impact (ie, deletion of) my iMovie Events?
You really need to ask that on the iMovie forum. It's very possible that it just links to the material stored in iPhoto.
2. How can I find out size of iPhoto Books to see if it's worth moving them (and all those photos) to a second Library on an external drive?
Book projects are not large. They are entries in the database only. They take up negligible amounts of space.
There is no way to move a book from one Library to another.
I have 100GB in 15K photos & 227 movies, but Finder says iPhoto Library is 134GB.
The  iPhoto Window reports the nominal size of a folder if you exported everything from iPhoto at the Current setting.
The Finder reports the size of the Library Installation. This includes: Original shots, Preview of Edited shots, thumbnails, database files, cache files and so on. All of these are required for iPhoto to work. There is no material in the Library that can be deleted.
If space is an issue you can run a Library from an external disk:
Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
2. Copy the iPhoto Library from your Pictures Folder to the External Disk.
3. Hold down the option (or alt) key while launching iPhoto. From the resulting menu select 'Choose Library' and navigate to the new location. From that point on this will be the default location of your library.
4. Test the library and when you're sure all is well, trash the one on your internal HD to free up space.
Regards
TD

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