External editor linking and data loss

Hello,
I know this has been discussed before, but there seems to be a bit of confusion in some of the posts here and I'd like a fresh answer, please
I'm using Photoshop as my external editor for iPhoto. When double-clicking a photo in iPhoto, one of three things will happen:
1) If the original photo was a RAW photo, it will open the RAW in PS. (I've chosen this function in iPhoto).
2) If the original photo was a jpg and it has NOT been edited at all, (this includes even rotating the photo), iPhoto will send the original jpg (from the "Originals" folder in iPhoto) to PS. I can double check this by choosing "Save As..." in PS to see the source directory.
3) If the original photo was a jpg and it HAS been edited, iPhoto will send the modified jpg (from the "Modified" folder in iPhoto) to PS. I can double check this by choosing "Save As..." in PS to see the source directory.
My questions are these:
- Is there anyway to always open the original photo with photoshop?
- Can't Apple come up with a more efficent way to rotate a photo without having to save an entirely new version of the photo in the "Modified" folder?
- (This is a toughy): I know that resaving a jpg in an image editing program like PS can recompress the jpg everytime you save, and this brings down the quality of the shot. When iPhoto saves a new rotated version of a jpg, does it lose quality as a second generation? I know that the file size changes, (2.8MB for the original, 2.1 for the modified), so has this new "Modified" jpg been recompresed?
Thanks for your help,
mario
G5 Mac OS X (10.4.7) Logic Pro • RME Fireface 800 • us2400

mario
- Is there anyway to always open the original photo with photoshop?
Yes, duplicate the Original (Right click -> Duplicate) but there is no way to have multiple modifieds associated with a single Original. (however, this is possible in Aperture).
- Can't Apple come up with a more efficent way to rotate a photo without having to save an entirely new version of the photo in the "Modified" folder?
Im sure they can, but here's the thinking about it: iPhoto never changes the Original. Rotation is a change, so, the modification is made on a copy. Why should there be an exception for rotation? And if you make an exception for rotation, why not red-eye?
- (This is a toughy): I know that resaving a jpg in an image editing program like PS can recompress the jpg everytime you save, and this brings down the quality of the shot. When iPhoto saves a new rotated version of a jpg, does it lose quality as a second generation? I know that the file size changes, (2.8MB for the original, 2.1 for the modified), so has this new "Modified" jpg been recompresed?
Not a toughy at all. Everytime you save a jpeg it is recompressed. Yes, data is thrown away as testified to by the file size.
What you're looking for here is lossless editing. From your questions, I think you're reaching the limit of iPhoto. It may be time to look at Aperture, which can do lossless editing, have a single Master associated with many versions etc. Definitely a learning curve...
Regards
TD

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