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I wonder why you have XMPs on the first place. *If* ACR creates XMPs, then the adjustments are not recorded in the DNG file. This happens if the DNG file is write protected.
Pick any DNG file from yesterday or earlier, check the date of last modification. Load it in ACR, make some changes and save it ("Done"). Check the date of last modification: it should be updated. If not, then an XMP file has to be there, EXCEPT if you selected "Save image settings in Camera Raw database", in which case you deserve what you get.
You're misunderstanding me. I've JUST STARTED converting my raws to DNG's. The XMP's I'm talking about are ones that Bridge generated in the past whenever I manipulated a raw file (in ACR). I'm confirming that all that pre-existing XMP stuff gets properly incorporated into the DNG I generate from the raw file.
pax / Ctein
Ctein, the converter should copy the XMP inside the DNG.
FYI, you can also use ACR to convert the files to DNG.
What version of Photoshop/Bridge/ACR/DNG converter are you using?
Did you try yourself, putting a raw file, on a folder, with XMP, then converting to DNG, move the DNG in another folder, and compare both files in two Bridge windows?
But to answer the question directly, all metadata is stored within the DNG file. This includes all data that is normally stored in XMP files associated with raw files. The DNG file does not require the XMP file unless, for some reason, you change the DNG file to a read-only file.
Dear PE and Jim,
Thanks for the hand-holding.
Yes, I ran an experiment first-thing, where I compared how Photoshop/ACR opened the original raw+xmp files to the derivative DNG files, and it looked like the xmp data got bundled in.
But with a coupla thousand files to convert, I didn't want to discover halfway thru that I'd missed something. Better to ask for definitive opinion.
Now I have it! Much thanks.
BTW, still on CS3 for Bridge/Photoshop, but running latest version of DNG Converter (220.127.116.11) as a stand-alone.
pax / Ctein
I would not consider myself as a definitive source, I'd like to have Thomas Knoll or Eric Chan chime in...
Yes, Ctein, the sidecar XMP metadata is included in the DNG header. If you edit the DNG with Camera Raw, then CR will update the editing metadata within the DNG. (The exception is if you've made the DNGs read-only, in which case CR will go back to using sidecar XMPs.)
Thanks for the hand-holding [smile]. I appreciate it.
Now if I can only figure out what's wrong with the blankety blank preview JPEGs...
pax / Ctein
Ctein, I'm guessing your DNGs are corresponding to a camera model that the OS does not recognize, or they are missing some metadata that the OS is looking for. In general, the OS does not render previews unless it recognizes the camera model.