Importing DNG - no adjustments imported

hi,
i am trying to import a large project which i worked on (4000+) images.
i worked on this project before installing aperture. in my previous workflow i was using ACR to do the raw editing/first conversion, then convert the files in DNG and import them in IVMP. so the DNG preview would be matching the file adjustment.
i just imported the project in aperture, and no adjustment come through. no WB, no exposure, nothing.
what can i do? doesn't aperture support DNG? am i doing something wrong? i cannot rework the 20000+ images i shot since using DNG....
thanks,
@lberto
MacPro Mac OS X (10.4.8)

Here's my understanding...
When you adjust a RAW image with ACR (a RAW converter), the settings are saved in an XMP sidecar because ACR doesn't like to modify a RAW file. But when you adjust and save to a DNG file the settings that would otherwise be saved in the XMP sidecar are saved in the DNG. Adobe can do this because Adobe created both ACR and DNG. (Also, Adobe wants you to use Photoshop.) The settings saved in the DNG are just instructions that tell ACR and only ACR (at present) how to process the RAW image when it is brought into Photoshop.
ACR saves an updated preview thumbnail in the DNG and that is what you see in IVMP and PhotoMechanic. IVMP and PhotoMechanic are not RAW converters. In other words, they can't take the ACR instructions inside the DNG and change the RAW to a JPEG, TIFF, or PSD. They just let you see the preview thumbnail. They don't care about the original RAW data because they are not RAW converters, so they don't need to show you the original. They show you the adjusted preview thumbnail so you will use their program in conjunction with your Photoshop workflow.
Capture One is another RAW converter. It cannot take ACR conversion instructions and apply them in Capture One because CO uses it's own conversion algorithms. The same with the proprietary camera manufacturer's RAW conversion software.
Aperture is also a RAW conversion software that uses its own conversion algorithms. It is not Photoshop, so it cannot use Photoshop's ACR conversion data. When you load an adjusted DNG into Aperture it initially sees the adjusted preview. But then Aperture builds a thumbnail with the original RAW data (as it should) because Aperture adjusts the RAW master file.
White balance, exposure, and other adjustments settings are not imported into Aperture. I would not expect them to be. Those are ACR (Photoshop) adjustment instructions, not Aperture adjustment instructions.
Even Lightroom, another Adobe program that offers RAW conversion, does not currently read the ACR adjustments from a DNG. Load adjusted DNGs into the current beta of Lightroom and it does the same thing as Aperture. It looks past the ACR generated preview in the DNG and creates a preview from the RAW data. However, being an Adobe product, you might expect Lightroom to eventually be able to read the ACR adjustment data in a future version. Lightroom may be the route you will eventually have to take to perserve your many adjustments unless you are willing to convert your DNGs to TIFFs or PSDs and import those into Aperture.
I believe the DNG specification was intended to create a standard in the RAW file format (unadjusted). It is not a standard for transferring image adjustments between diverse RAW converters.
Again, this is just how I understand it...
-Karen

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