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20 votes
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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 ...
James Snell's user avatar
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6 votes
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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 ...
StarGeek's user avatar
  • 3,783
6 votes
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IPTC vs XMP: how do they differ

Poring over the Wikipedia entries: What you call "IPTC" is really the "IPTC Information Interchange Model" defined by the "International Press Telecommunications Council"....
xenoid's user avatar
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4 votes
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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," ...
Warren Young's user avatar
  • 5,224
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-...
junkyardsparkle's user avatar
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 ...
Michael C's user avatar
  • 175k
3 votes
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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 ...
Michael C's user avatar
  • 175k
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 ...
ths's user avatar
  • 7,152
3 votes
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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 ...
StarGeek's user avatar
  • 3,783
3 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 ...
Andreas Jansson's user avatar
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 ...
Aurélien Pierre's user avatar
3 votes

Is there an exif tag for face areas?

The Metadata Working Group regions tag (XMP-MWG) is the defacto standard for storing face regions. This is where most modern software stores the data whether it is ...
StarGeek's user avatar
  • 3,783
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 ...
MirekE's user avatar
  • 5,205
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/...
scottbb's user avatar
  • 32.6k
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 ...
FotisK's user avatar
  • 343
2 votes

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

Even though it has "EXIF" in the name, Exiftool can read and write all of these standards. It's very powerful and easy to script so you can write to all the locations you like in the way you need for ...
mattdm's user avatar
  • 143k
2 votes
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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/...
Olivier's user avatar
  • 4,173
2 votes
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How to recover and load XMP from exported JPEG in darktable?

You can extract the XMP information (structured) via command line with exiftool: exiftool -xmp -b image.jpg >name_of_raw.xmp ...
Romeo Ninov's user avatar
  • 11.9k
2 votes
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How do I set the preserved filename with exiftool only on the first time?

Combining the "write only if not already existing" script snippet from this forum post with the "write preserved filename without file extension" expression from here, you get the ...
Philip Daubmeier's user avatar
2 votes
Accepted

ExifTool, apply default.xmp to all RAW images in the folder

This would be Example #13 on the Metadata Sidecar Files page except instead of using -TagsFromFile @ you would hardcode it to your default file, ...
StarGeek's user avatar
  • 3,783
2 votes

XMP sidecar file editor

ExifTool supports that if you are fine with command line. https://exiftool.org/metafiles.html
Euri Pinhollow's user avatar
1 vote

Migrating away from Picasa - "Write faces to XMP" changes the hashes of images

What you'll want to use are XMP sidecar files. These hold XMP data such as image face regions and IPTC Core/Ext data in a file with the same base name and an .xmp ...
StarGeek's user avatar
  • 3,783
1 vote

Migrating away from Picasa - "Write faces to XMP" changes the hashes of images

From your comments I understand you currently have an image library in Picasa, with photos which might become duplicated in the future (due to re-downloading). To ease the deduplication process you ...
Saaru Lindestøkke's user avatar
1 vote

Why do I lose my edits after creating HDR raw files in Adobe CC Bridge ACR and enhancing them,

I fixed it. Adobe told me to clear my cache, which didn't work. I did two things that appeared to work, not sure which one did it. First, I deleted both Photoshop and Bridge, chose the option to not ...
Todd Quam's user avatar
1 vote

Can multiple versions of virtual edits be stored in the same .XMP sidecar file?

Unfortunately you are right, XMP file store the changes of original file. Edits of virtual copies are stored in to the LR catalog. Do not be mislead by the naming of files on export, they are related ...
Romeo Ninov's user avatar
  • 11.9k
1 vote

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

Here is how Lightroom write in XMP keywords for file: ...
Romeo Ninov's user avatar
  • 11.9k
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. ...
Euphoria's user avatar
  • 101
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 "...
xiota's user avatar
  • 27k
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.
Mica's user avatar
  • 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 ...
user681768917's user avatar

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