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20 votes
Accepted

How do XMP files encode aperture?

The Exif:ApertureValue is stored as an APEX value as mandated by various EXIF standards. The APEX system is a way to calculate exposure and works using base-2 logarithms. The use of base-2 means a ...
  • 9,440
5 votes
Accepted

What is the proper formatting of the Subject Tag in XMP?

The interface for a lot of programs with regards to keywords is to show them as a comma separated string. But the important thing to remember is that they are not stored as such. They are stored as ...
  • 3,369
4 votes
Accepted

Are there any downsides to automatically writing changes to XMP files in Lightroom?

feels wrong to clog up my folders with thousands of xmp files that I'll probably never use You say "Lightroom CC," by which I assume you also have Photoshop. Every time you say "Edit in Photoshop," ...
  • 5,164
4 votes

Darktable XMP sidecar filters repository

There's https://dtstyle.net It's a repository of *.dtstyle files, not XMP files... those are generally used for file-specific information. Styles can be managed in the "Styles" panel on the right-...
3 votes

Is there any way of achieving cross-application non-destructive RAW editing? (Maybe xmp files?)

They're all proprietary. Each application uses their own algorithms to convert the raw data. To the best of my knowledge none of the adjustments made with one application will translate identically in ...
  • 169k
3 votes
Accepted

Using exiftool to import date, gps and tags from xmp files

See exiftool's Metadata Sidecar Files example #15 The command needs to be altered a bit due to some irregularities in the XMP sample you give. The best thing to do would be to grab the xmp2exif.args ...
  • 3,369
3 votes

Can I safely delete XMP files after creating JPEGs?

Sure, if your picture is exported in JPEG, it's safe to do whatever you want on the RAW source. XMP files are just an archived history of the processing stages on the RAW file (settings and parameters ...
3 votes

Sharing Lightroom images in DNG with ability to undo/redo edits in another application?

Only Lightroom and Photoshop (specifically the ACR engine they share) are able to understand the proprietary edit information, whether it be embedded in the DNG or a sidecar XML file. In fact, it's ...
  • 6,800
3 votes
Accepted

Sharing Lightroom images in DNG with ability to undo/redo edits in another application?

Are there any applications other than Lightroom in which I can undo/redo Lightroom edits if I already have the DNG? No. Each raw processing application is proprietary. Each application uses different ...
  • 169k
2 votes

Editing and saving RAW files, and the relationship to the XMP sidecar files

Deleting the XMP file does not cause the Raw file to "revert" to original state. Because Raw files are NEVER edited. The VIEW will revert, but the Raw file data was never changed. Instead, the LIST ...
  • 12.6k
2 votes

Editing and saving RAW files, and the relationship to the XMP sidecar files

Many image processing programs do what's called nondestructive editing, where the original file is treated as you would a film negative and left untouched. Realistically, there's not a whole lot of ...
  • 5,432
2 votes

Lossless modification of JPEGs according to XMP metadata

I turned on the option "Include Develop settings in metadata inside JPEG" in Lightroom. What this option basically does is saving the recipe to reproduce all the Adjustments you made within the JPG ...
  • 1,488
2 votes

How do I get Exiv2 to apply metadata from a static XML file to several images?

exiv2 seems to really prefer keeping the basenames of image files and sidecar/metadata files matched. You could automate (script) the creation/deletion of copying/renaming the metadata files like you ...
  • 31k
2 votes

Are there any downsides to automatically writing changes to XMP files in Lightroom?

So, are there any downsides to activating this option? Some people apparently experience minor performance impact when the data is written to the disk. I see no difference on an SSD. Obviously, you ...
  • 5,115
2 votes
Accepted

Is there any way of achieving cross-application non-destructive RAW editing? (Maybe xmp files?)

After a few days of research, I've concluded that at the time of writing there is no holy grail. But as for futureproofing I'd go the following route: keep the original RAW file work with Adobe ...
  • 333
2 votes

Picture Metadata and Face Tags: What Software to Write and Read them?

Here are two more programs that may fit into your nice overview table above. DigiKAM (OpenSource, free). People tagging is present, stored as XMP regions. You just need to configure digiKam so that ...
2 votes
Accepted

How does XMP define the face region?

The XMP files created by Lightroom seems to follow the MWG description (website currently down), as it contains this link to describe its content : xmlns:mwg-rs="http://www.metadataworkinggroup.com/...
  • 4,113
1 vote

What is the proper formatting of the Subject Tag in XMP?

Here is how Lightroom write in XMP keywords for file: <lr:hierarchicalSubject> <rdf:Bag> <rdf:li>Edfu</rdf:li> <rdf:li>Egypt</rdf:li> <rdf:...
  • 9,721
1 vote
Accepted

Picture Metadata and Face Tags: What Software to Write and Read them?

Seems Adobe Lightroom Classic is a good choice for my needs. When I add metadata to images (Title, description and photo Taken date), it seems to update any related tags for EXIF, XMP and IPTC. ...
1 vote
Accepted

Can two AV files share one sidecar file?

XMP files do not contain references to the original image file, so in principle, it is possible to use the same XMP file for multiple images with different extensions. ExifTool does not normally "...
  • 26.5k
1 vote
Accepted

Generate XMP sidecars automatically on Digikam

You should import the hand copied files into digiKam, then it should write hte XMP files.
  • 134
1 vote
Accepted

Is XMP metadata future safe?

Only God really knows that... ;-) Actually Extensible Metadata Platform was introduced in 2001 (16 years ago) and today it can be located in several file types and is supported by tens of freeware ...
1 vote

Is there any way of achieving cross-application non-destructive RAW editing? (Maybe xmp files?)

The DNG file format will allow saving adjustment information directly in the file, rather than a sidecar file, and the DNG format is a documented specification that is free for anyone to use. Some ...
  • 141
1 vote

How do XMP files encode aperture?

This is a partial answer. According to this list Exif.Photo.ApertureValue is "The lens aperture. The unit is the APEX value." Which is confirmed by Wikipedia article on APEX. No idea how to make the ...
  • 8,334
1 vote

multiple xmp versions of same raw file?

If you're using darktable, then select the image in lighttable mode and push 'duplicate'. The button can be found under the 'selected images' control group. Relevant User Manual Page
1 vote

multiple xmp versions of same raw file?

Why do you want to store them in sidecars specifically? If Adobe Lightroom is an option for you, this software is purpose-built for this sort of scenario. You can create multiple "virtual copies" ...
  • 2,574
1 vote
Accepted

creating xmp files without the original raw files

Several ifs involved here. If you can see an image to edit I would assume that the originals were saved with smart previews enabled. If so, any edits to the preview will be applied to the original ...
  • 6,156
1 vote

How do I get Exiv2 to apply metadata from a static XML file to several images?

Have you try this way: cat Photo1.xml | exiv2 -i - thumb_Photo1.jpg This command will send the content of Photo1.xml to STDOUT and the next command will use it as STDIN and insert it in to ...
  • 9,721
1 vote
Accepted

Lightroom TIFF XMP sidecar missing?

At your step 5., when you export a RAW file from LR to PS (or when you open a RAW file with PS, make some editing and then save it in TIFF format and import it back to LR), a TIFF get created. However,...
  • 4,113
1 vote

Lightroom: add keywords from textfile to raw images (xmp file)

I believe your CSV file will need a couple alterations. First, I don't think Exiftool will read a tab delimited csv. The docs seem to indicate comma separated only. You could import into Excel or ...
  • 3,369

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