rfreschner wrote in post #2340478
Quite honestly, I don't know of any RAW converter that actually makes changes to the RAW image so this would be true of the others as well.
Photoshop will allow you to save a file over the top of the RAW file or any file for that matter. Photoshop does not care where it saves anything and it will overwrite any file you tell it to and be perfectly happy about it.
Aperture will not allow that to happen. Same goes for originals in JPG, TIFF, or any other format that Aperture supports. Once you suck it into the library, it will create versions (as xml instruction files) but it will not touch the original in any way, shape or form. Everything is contained in an xml sidecar file.
Even when a file is edited in photoshop passed from Aperture, it gets a copy created from the last edits done in photoshop . The edited file when saved by Photoshop is then added to the Aperture library as a version. Original still untouched.
In point of fact, Aperture takes this to such an extreme, that one cannot even write or edit metadata and store it back in the original file. I like to do this because then I can easily move original between libraries or recreate libraries in the event of a crash (not that this is a problem with Aperture - it isn't). So, I import with IVMP, set up the metadata that matters (keywords, dates, places, etc...) sync that back to the file and then import with Aperture where the metadata is read.
J.
J.