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To update a DNG file?????

-0001-11-30   Views:0

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Lightroom v1.1 has the following in its Help File---- Save metadata changes to the file manually * Select one or more photos and choose Metadata > Save Metadata To File. * In Grid view, click the down arrow icon in a thumbnail image to save (update)

Lightroom v1.1 has the following in its Help File----
Save metadata changes to the file manually
* Select one or more photos and choose Metadata > Save Metadata To File.
* In Grid view, click the down arrow icon in a thumbnail image to save (update) the metadata in the file.
Note: The Save Metadata To File command does not update metadata in a DNG file. To update a DNG file, choose Metadata > Update DNG Preview & Metadata.
My 1st question is--
If one maintains their photos in DNG format, based on the above statement does it make ANY sense to check the option File->Catalog Settings->Automatically write changes to XMP?
Taken literally, it seems to me that LR DOES NOT write changes (either manually or automatically) to XMP in a DNG file, unless one specifically uses the "Update DNG Preview & Metadata".
My confusion comes from the process in v1.0 for DNG metadata changes. v1 would save metadata, but you needed ACR 4.X to separately update the JPG.
Which leads me to my 2nd question-
Is Adobe using Preview and embedded JPG as the same thing? I'm assuming :) that what's being updated is the embedded JPG in the DNG and perhaps also any preview in the database.
Obviously, any comments would be appreciated.
Dave

The replay answer
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GreSep wrote: I saw another LR discussion that said that with LR 4.3 updating Capture Time would also update Date Time Digitized but it does not do so for me on my DNGs (and as of last month ALL my images were converted to DNGs).
One or two intermediate versions of LR 3 (perhaps Lr 3.6) set DateTimeDigitized when you gave the Metadata > Edit Capture Time command. But for people managing scans in which the capture time of the original image was different than the scan time, this behavior overwrote their scan times, so Adobe backed out of that change.  Before and since those versions, the Metadata > Edit Capture Time command just changes the EXIF:DateTimeOriginal and related fields in XMP and IPTC.

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