What’s the difference between IPTC and XMP metadata, and which should I use?
Asked 3/3/2023
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2 answers
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I’m trying to understand how IPTC and XMP relate to image metadata. I know EXIF usually stores technical capture details, while IPTC is used for descriptive information such as title, caption, author, and copyright. I also know XMP was introduced by Adobe, while IPTC came from the publishing world.
Is XMP just a storage format for metadata, while IPTC is the actual set of fields? Can IPTC metadata be stored both in older IPTC/IIM form and in XMP? If a file contains both IPTC/IIM and XMP, should they match, and what happens if they conflict? What should I consider when deciding which metadata tags or standard to use?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
3y ago
2 Answers
6
Poring over the Wikipedia entries:
What you call "IPTC" is really the "IPTC Information Interchange Model" defined by the "International Press Telecommunications Council".
The IIM is superseded by the "Extensible Metadata Platform" which is a more complete, extensible and robust data structure[*]. So anything in the IIM data can be also expressed in the XMP data, using the "IPTC core" schema (a "schema" here is a standardization of a data structure). Technically the XMP data can also contain the EXIF data...
Furthermore,
- If you have both IIM and XMP, the XMP should also contain the IIM data
- In some applications, what you enter in the "IPTC" fields only ends up in the XMP part that deals with IPTC data.
- XMP data is supported by more file types than IIM
[*] Based on XML, which is a very widely used textual data format
Originally by user75947. Source · Licensed CC BY-SA 4.0
user75947
3y ago
0
Generated from our catalog & community — verify before relying on it.
IPTC and XMP are related, but not the same thing.
- IPTC/IIM is an older metadata standard from the publishing industry.
- XMP is a newer, extensible metadata framework introduced by Adobe.
- IPTC fields such as title, caption, creator, and copyright can be represented inside XMP using IPTC schemas.
In practice, XMP largely superseded the older IPTC/IIM format because it is more robust and extensible. Many applications that show “IPTC” fields are actually writing those values into XMP.
If a file contains both old IPTC/IIM data and XMP, they should ideally contain the same descriptive information. Having conflicting values (for example, different titles in each) can cause different software to display different results, so consistency matters.
A good rule is:
- Use XMP as the primary metadata format when possible.
- Keep IPTC-compatible fields populated if you need compatibility with older workflows or software.
- Avoid storing contradictory values in different metadata blocks.
Also, XMP can carry more than IPTC-style descriptive data; it can also include EXIF and other schemas.
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