Using CHDK with my Canon A550 I get DNG files that do not have an embedded preview image only a very small thumbnail (see this question). However, alongside the DNG a full resolution JPEG file is created by default. Can I somehow use that existing JPEG file as the DNG preview? Is there some kind of tool to take that file and embed it inside the DNG? If so, would that be faster than generating and embedding DNG previews via Lightroom?
The JPEG and DNG files have the same filename except for the extension.