I want all my DNG files to have full size previews that I can see in Portfolio or iView, especially the latter's lightbox. It's set me wondering about the best way to get full size previews for DNG's created before Adobe Camera Raw had the option to create them.
The method I've adopted is to use a Bridge find on each "bucket", listing all the items in its subfolders, then opening all of them in ACR, selecting all, and then applying Export Settings. While the find is slowish, I'm finding no problem opening a couple of thousand images at a time, and its main attraction is that it's more "inline" and right in principle, preserving all cataloguing links. An alternative, reprocessing the files with the DNG converter, would force me into duplicating the bucket folder structure, then renaming the large preview and deleting the original structure. While I'm all backed up, I'm always frightened by deleting anything!
So having put these alternatives, I just ask if there's a better way? If not, then hopefully this posting will help oithers. For me, it's almost too late - I'm babysitting a computer (background) processing all my DNG's. April 2004 right now....