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I don't know how is Mac's command-line used, but once you're there, type:
exiftool -b -JpgFromRaw anyfile.dng>full_preview.jpg
-this will create "full_preview.jpg" file from "anyfile.dng". Some DNG's may have only medium size preview embedded. In this case, use:
exiftool -b -PreviewImage anyfile.dng>medium_preview.jpg
PS: If you're interested on Windows solution, then please, visit my site http://freeweb.siol.net/hrastni3/ and look after ExifToolGUI.
Thank you very much for your reply. I tried using the Command Line but it didn't work on the first go. I'll try some more, because ultimately I'd like to be able to script the whole process because of the large number of images to process. If I can do it on Windows, is your app scriptable so I can batch many images?
Sorry, it isn't scriptable... and Extracting/Embedding preview is only single file operation, while all other (metadata) operations are multifile capable.
Inside GUI, Extracting/Embedding preview is a feature actually -as it has nothing common with metadata.
I realize this isn't what you were looking for. But two methods that I use for "batch" conversion to JPEG are:
1. Load all the images into ACR, choose the Select All option, save the JPEG images.
2. Use the Bridge/Image Processor or the Dr. Brown's utility to create JPEG copies of your images.
Either one of those methods work very well for me. But if you want to do this outside of the Photoshop/Bridge environment then someone else will have to provide the solution. I don't know how to simply extract the JPEG image. I guess that is why I do it the easy way.
Have you posted your question in Phil Harvey's forum?
Is this something you are looking to add to your workflow after running the DNG Converter?
The reason I ask is that not all DNGs have the full size preview.
This sounds similar to other requests that have been made here for a DNG-aware post-processing tool that performs some metadata updates and/or extracts the JPEG preview.
Thanks Geo, I am about to post the same question to Phil Harvey's forum.
David, basically after I work on the DNG's in Camera Raw, I need to extract the jpeg previews (batched). That's all. Thought it might be a simple thing.
I'm not too well informed in this area. But wouldn't it be just as easy to load all the images into ACR and then save JPEG copies?
There is a free ware PC program called Preview Extractor that will automatically do this for you.
Their web address is http://drchung.new21.net/previewextractor.
Oops I just re-read the info on it and it only works on Nikon RAW files not DNGs.