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iPhoto ’11: The Macintosh iLife Guide to using iPhoto with OS X Lion and iCloud by Jim Heid, Michael E. Cohen, Dennis R. Cohen

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Editing an Already-Edited Raw Photo

If you edit a raw photo that you’ve already edited, iPhoto returns to the original raw version of the photo and applies all the changes you’ve made—today’s as well as yesterday’s. This non-destructive editing gives you far more flexibility than earlier iPhoto versions provided. You can edit an image as many times as you like without worrying about introducing quality loss each time.

The exception to the rule. Ah, but there’s an exception. If you edited a raw photo using the older iPhoto ’06, iPhoto ’11 applies your latest edits to the edited JPEG that the older version of iPhoto created. Open that edited raw photo in edit view, and any new edits you make are applied to the JPEG version.

So what do you do if ...

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