Editing jpgs in iPhoto

In iPhoto, I know if I make an adjustment to a jpg, then a new version of the picture with the edits is created. Of course, creating a new version degrades the jpg just a wee bit, but I don't think it's noticeable, so that's OK with me.
My question is: if I go and make ANOTHER set of adjustments sometime later, is the new version that iPhoto makes based on the master with ALL the adjustments, or is it creating ANOTHER version off the last new version, thereby degrading the photo twice?

bk1000
It's the former - iPhoto goes back to the Original and re-applies the sum of the edits to create a first generation new version. You never go past a first generation copy.
This article describes how non-destructive editing works:
http://docs.info.apple.com/article.html?path=iPhoto/7.0/en/11464.html
Regards
TD

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