Graham & harringg,

If I understand iPhoto import correctly (and in full disclosure, iPhoto to Aperture is a weak area for me, and on my list of things to get my learnin’ on and write a book about!), the ones tagged “iPhoto Original” are the images that came out of the camera. The ones that are NOT tagged are the ones that you altered in iPhoto. See, iPhoto isn’t non-destructive, like Aperture is. Whenever you make a change to an image in iPhoto (i.e. fix redeye, exposure, even rotation), it saves a new version and replaces the previous one. However the original file from the camera is always retained, so you can “revert to original” in iPhoto.

It’s quite possible that iPhoto generates a new file for every single image imported, even if it’s not altered. That I don’t know.

I would suggest that you can safely delete all the “iPhoto Original” keyworded images. Alternatively, you can re-do any work you did in iPhoto, and work from the “iPhoto Original” images, but that’s up to you.

As harringg suggests, you can easily find them with a keyword search. However you don’t need to put them in an Album first. Just click on the Photos icon in the top of the Library list (it’s the second one down, under Projects then filter that using the search window in the top right of the Browser. Click on the little magnifying glass to open the search window, and click Keywords, then scroll through and look for the “iPhoto Original” keyword.

You could always export all of those results and burn them on a DVD or store them on a separate drive if you’re unsure if this is what you really want to do.