Lightroom :: Lost Retouches When Converting To DNG From CR2
Jun 23, 2013
I had a folder of images in my catalog containing .cr2 and .xmp that I retouched in LR4, I then converted these images to .dng, throwing away my original files. Now when I go to that folder in LR5 (upgraded from LR4), all of my ratings and previous retouches are gone, as all I have is the original raw images in .dng format. I'm guessing tihs is because I didn't or LR5 didn't save my modifications to the sidecar files, before the conversation. Fortunately, I have backups of the original .cr2 & .xmp files and they (or the LR4 catalog) hopefully contain the retouches. With this in mind, what's the best way to reimport the .cr2 & .xmp files, and reconnect them to the same folder in the catalog?
Should I remove the .dng files, restore from backup to the folder and expect LR4 to see everything? Or do I need to import the images back into the catalog? Did converting to LR5 update my catalog, and do I need to restore the previous LR catalog too?
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Apr 5, 2014
I was recently reading on a Nikon Forum where a writer stated that some data is lost when converting to DNG in Lightroom.
Every compression algorith is flawed if a single bit is lost and the original can not be recreated. Since the DNG converter must know about your camera model and it actually converts the NEF into an image before compressing the image, AND you can not, after converting to DNG convert back to original NEF, it is to me obvious that it is indeed a lossy compression, not just 'simple' data compression like zip, tar or whatever other type of data compression you want to compare with, which is truly lossless.
The Nikon lossless compression works entirely on data compression principle, preserving every bit and recreating every bit of data when you edit the raw image, and that can not be done once the image is converted to DNG. That is why many people, who use DNG, also preserve the original NEF, which in my opinion, is a totally pointless work flow. The only reason I can see to use DNG is the ability to share the image with somebody else who is not able to edit NEF, but I might as well use TIFF in that case.
The DNG converter must have knowledge of the camera model concerned, and be able to process the source raw image file, including key metadata to be able to convert and compress. A real lossless compression algorithm NEVER looks at the contents of the data because it is totally irrelevant for the converter to know what type of data you convert and try to compress, since it is based on mathematical patterns and statistics only.
I look at DNG like I look at PDF. A Word document, especially with photographs in it, can be converted to PDF and it may look like you have not lost anything, but yes, you have lost a lot actually and you can never ever recreate the original Word document with the same quality like you have had in your original.
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Lightroom 4.3, Windows 7, 64-bit...
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I did NOT write all my changes to the files on disk, which I normally do at the end of editing, but not ALWAYS...
This morning, I started Lightroom, opened the same catalog, and NONE of my changes from yesterday were preserved. Nothing crashed, nothing closed abnormally, NOTHING unusual happened before, during, or after yesterday's editing. I closed Lightroom and rebooted the system. Reopened, no difference.
I went to the catalog partition and looked in the previews folders. There are MANY previews/files that show changes from yesterday, but in Lightroom I have NONE of what was done... White balance is back to "as shot", ALL the basic, detail, and other changes in develop aren't present, no Pick flags, no color labels, no NOTHING... In the preview files, there are only 45 files changed with today's date (I haven't touched anything, yet), but there are 1104 files changed yesterday, so there are changes in there, but they're NOT showing up in Lightroom.
how I can get the changes to show in LR again?
I'm going to have to go back through and redo all the changes because I don't have time to wait, but is there some way to FORCE Lightroom to read the catalog and previews and put the changes back? Or some other way to recover the changes (I'm presuming the changes actually ARE in the previews)...
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