Why do 16-bit PSDs edit differently than 12-bit RAWs?

When editing original 12-bit RAW files form my Nikon DSLR, there seems to be a great latitude with respect to Exposure, WB, and other adjustments. Upon editing the RAW externally in Photoshop (as a 16-bit PSD), and saving it, the resulting file back in Aperture handles Exposure and WB adjustments with practically zero latitude. In fact it feels the same as when I'm editing an 8-bit JPG.
When I edit externally, doesn't Aperture convert the 12-bit RAW file into a 16-bit PSD? Those are certainly the settings in my preferences. Why then, does the 16-bit PSD handle as if it has 8-bit depth.

gordonf238 wrote:
When editing original 12-bit RAW files form my Nikon DSLR, there seems to be a great latitude with respect to Exposure, WB, and other adjustments. Upon editing the RAW externally in Photoshop (as a 16-bit PSD), and saving it, the resulting file back in Aperture handles Exposure and WB adjustments with practically zero latitude.
The RAW conversion from pretty much straight RAW image data only occurs once. Therefore if you start in Photoshop once you convert in Adobe ACR the ability to perform RAW edits is gone. Once edited you can bring a lossless PSD or TIFF file into Aperture but the RAW data only exists in the original RAW file.
HTH
-Allen

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