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I'm pretty sure iPhoto does store them in their original form—unless they were originally in RAW, in which case they get converted to .jpeg, I think.

• rbanffy 16y ago
  Then why would there be a risk of data loss during a version upgrade?
  • djacobs 16y ago
    I'm not sure. I'm just commenting that in iPhoto (and I just upgraded to '11) they are stored uncompressed and in their original format.