Changing JPEG to DNG in a collection to establish

I have a collection of about 18 000 photos.  Currently, they are all JPEG files.  About half was initially shot in RAW.  After recently Lightroom 3 and see what he can do, I would replace the 6 or 7,000 JPEG files that are converted into RAW images with the original RAW converted to DNG.  The RAW and JPEG have the same file names.  I do not duplicate the older with the jpegs converted DNG files.  I know I'll lose the keywords associated with the JPEG format which I replaced.  Apart from the creation of an entirely new collection and from scratch, is there a good way to do this?  TIA

I had the very light problem and I found a tool that helped me to synchronize attributed all of the keywords of my jpg for my dng files based on the file names.

You might want to check it out at http://www.photographers-toolbox.com/products/jbeardsworth/syncomatic/

Here's how I did it:

I got 6500 JPG images in a Lightroom Catalog

I imported all my NEF images in the same catalog and asked Lightroom to convert to DNG.

I then had 13000 images made pairs of DNG and JPG for the same shot in the catalog. JPG and DNG files in a pair with the same name

After the installation of Syncomatic Plugin in Lightroom, all I had to do was then select (in the library, the grid view Mode) of multiple pairs of images and ask Syncomatic sync side and keywords from JPG files to DNG files

Beware, however, that Syncomatic doesn't handle very well large batches of files. At least it didn't for me. Initially, I selected all the images of 13000 and launched Syncomatic but soon realized he was treating 1 pair of files every 50 seconds. It would have taken some 90 hours of treatment. I stopped and then tried with smaller batches, and it worked much better.  What works best for me was to synchronize batches of 480 files (240 photos) at a time.

I also had another problem with some of my collections. Syncomatic crashed trying to assign images in their respective collections. So I asked it not to synchronize collections and had to manually rebuild.

I hope this helps.

Tags: Photoshop Lightroom

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