DNG and XMP

Forum|Forum|3 years ago
February 7, 2023
3 replies
4958 views

I just want to understand this — I have enabled the option "Automatically write changes into XMP" in Catalogue Settings, but there are no sidecars, because, as I understand metadata is embeded into DNGs? So, then what this option does in my case? What is the difference if it's checked or unchecked when there are no XMP files anyway?

macOS

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dj_paige

Legend

I have enabled the option "Automatically write changes into XMP" ... What is the difference if it's checked or unchecked when there are no XMP files anyway?

If you check the option, your metadata and edits are written into the DNG file. I you don't check the option, then nothing is written into the DNG file.

DdeGannes

Community Expert

Additional info also available at the link below.

https://helpx.adobe.com/lightroom-classic/help/metadata-basics-actions.html

Regards, Denis: iMac 27” mid-2015, macOS 11.7.10 Big Sur; 2TB SSD, 24 GB Ram, GPU 2 GB; LrC 12.5,; Lr 6.5, PS 24.7,; ACR 15.5,; (also Laptop Win 11, ver 24H2, LrC 15.0.1, PS 27.0; ) Camera Oly OM-D E-M1.

Conrad_C

Community Expert

The metadata is written to external XMP files when the format is either read-only (like camera raw) or doesn’t support it.

When the format does allows writing metadata to the file, then the command updates the file. So if you use that command when a DNG (or JPEG, TIFF, etc.) file is selected, the metadata portion of the file is updated, which doesn’t affect the image data.

H

hamadahiroAuthor

Known Participant

Thanks, so in my case, I guess DNG files allows writing metadata and they would be updated with the new data. Since there are no sidecar files, it must me within the DNGs.

johnrellis

Legend

"I guess DNG files allows writing metadata and they would be updated with the new data. Since there are no sidecar files, it must me within the DNGs."

Correct.

The wording of that option is misleading: "Automatically write changes into XMP". When the option is enabled:

- For file formats defined by industry standards (DNG, JPEG, TIFF, PSD, PNG), the metadata is written into three metadata sections in the file: EXIF, IPTC, and XMP (each section having its own data format).

- For proprietary raw formats, the metadata is written in XMP format into a .xmp sidecar.

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