How does iPhoto'11 maps modified photo with corresponding original photo?

Hello,
I see that every picture I edit in iPhoto, iPhoto keeps 2 copies of it - 1) of course the edited/modifed version 2) Original version, so that I can come back later and still get the original copy.
1. But I think it takes up a lot of space of local hard drive and I would iPhoto to only keep the final edited/modified version. Is there a way to set iPhoto property like this?
2. I would also like to know how iPhoto maps original version to the modified version, if there an xml that I can see? I would like to filter out my current photo collection. Suppose I have 1000 pictures and out of 1000, I modified 700. So iPhoto has 1700 pictures, so what I would like to do is that keep the modified version (700) and only 300 of the original. This way hard drive will be used only for 1000 pictures and I could save a lot.
Please help!
Cheers

1. But I think it takes up a lot of space of local hard drive and I would iPhoto to only keep the final edited/modified version. Is there a way to set iPhoto property like this?
No. Best advice if that's what you want is to use another application for your photos. iPhoto treats the original file like a film shooter treats the negative - it preserves it at all costs. It's also necessary for the non-destructive editing feature. If you're concerned about disk space you need to be realistic: Digitial Photoography requires a lor of space going forward. You can run an iPhoto 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.
I would also like to know how iPhoto maps original version to the modified version, if there an xml that I can see? I would like to filter out my current photo collection. Suppose I have 1000 pictures and out of 1000, I modified 700. So iPhoto has 1700 pictures, so what I would like to do is that keep the modified version (700) and only 300 of the original. This way hard drive will be used only for 1000 pictures and I could save a lot.
As Larry says, the relationship is tracked in the SQL database. Forget about trying to do what you want via this method. FOr a start, hacking the db won't delete anything. You'll still have to go in to the folders and delete the files. Here's a tedious way to do it: Export everything using any setting except Originals, empty the library and then re-import what you exported. Repeat endlessly everytime you edit. Be prepared for dataloss when you make a mistake in the process.
But really, doing what you want to do is exactly what iPhoto is designed not to do. Rather than trying to fix a spreadsheet so you can write your novel, wouldn't it be better to just use a Word Processor?
Regards
TD

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