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If lightroom classic is set to automatically write changes to xmp, does it also save them in the dng

New Here ,
Apr 11, 2021 Apr 11, 2021

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I shoot only raw images and convert to dng on import to Lightroom. My catalog settings have "automatically write changes into xmp" turned on. Will the changes also be written to the dng file, or are they only saved in the dng file if the catalog setting to automatically write changes to xmp is turned off?

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Adobe Community Professional , Apr 11, 2021 Apr 11, 2021
>I'm using Lightroom Classic latest version (10.2), does that change anything you said? No it is the same in 10.2. I had just answered a question on Lightroom 6 and still had that in mind. My mistake. The answer is exactly the same >Is it correct that all edits to a file are stored in the catalog in all cases? Yes. Lightroom Classic stores all edits in the catalog file. When you use xmp files, those are just a backup of the edits. The main storage is in the catalog. >You are saying that ...

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Adobe Community Professional ,
Apr 11, 2021 Apr 11, 2021

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Lightroom 6 will write the changes into the dng ONLY if the "automatically write changes into xmp" is turned on. Normally settings are only stored in the catalog file and only when you enable the setting will a copy of your settings be stored in xmp files or inside dng, jpeg, tiff, and psd files.

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New Here ,
Apr 11, 2021 Apr 11, 2021

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Thank you! I want to make sure I'm absolutely clear on this:

  • I'm using Lightroom Classic latest version (10.2), does that change anything you said?
  • Is it correct that all edits to a file are stored in the catalog in all cases?
  • You are saying that if the "automatically write changes into xmp" is turned off, the changes will be written only to the catalog, and not to either the DNG or xmp file. Is that a correct understanding?
  • If "automatically write changes into xmp" is turned on, then the edits will be stored in the DNG file, the XMP file, and the catalog. Is that a correct understanding?

Thanks for your help with this. I've poured through Adobe documentation and tried getting support from their online chat, but never found a clear answer to these questions.

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Adobe Community Professional ,
Apr 11, 2021 Apr 11, 2021

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>I'm using Lightroom Classic latest version (10.2), does that change anything you said?

 

No it is the same in 10.2. I had just answered a question on Lightroom 6 and still had that in mind. My mistake. The answer is exactly the same

 

>Is it correct that all edits to a file are stored in the catalog in all cases?

 

Yes. Lightroom Classic stores all edits in the catalog file. When you use xmp files, those are just a backup of the edits. The main storage is in the catalog.

 

>You are saying that if the "automatically write changes into xmp" is turned off, the changes will be written only to the catalog, and not to either the DNG or xmp file. Is that a correct understanding?

 

Yes that is correct. The setting is only there to provide a backup of the develop settings and other metadata. They are always stored in the catalog

 

>If "automatically write changes into xmp" is turned on, then the edits will be stored in the DNG file, the XMP file, and the catalog. Is that a correct understanding?

 

Yes. With the caveat that for dng files no xmp file will be created. The xmp data is stored inside the dng file. You only get xmp files for proprietary raw files such as NEF for nikon cameras. In all cases, all settings are stored in the catalog. You only should do the automatic xmp writing if you need those as a backup. In most cases you shouldn't do this as it does slow down editing.

 

 

 

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New Here ,
Apr 12, 2021 Apr 12, 2021

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Thank you! This is a super clear and detailed explanation, I appreciate your thoughtfulness and care. I have not been able to find this information anywhere else. Great answer!

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