Are photo keywords always stored in the same JPEG metadata field?
Asked 4/10/2017
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I want to read photographers’ keyword tags automatically when they upload JPEGs to my sports photography site. In one sample file, the keywords appear in IPTC APP13 field 2:025. Is that where keywords are usually stored, or do different editing programs write them to different metadata standards or fields?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
1
JPEG, TIFF, PSD, and other file formats can include numerous types of standards, so as long as your software can be written to detect and parse these standards, you should be able to extract the information you need.
Some of the standards that programs use to store meta data on images include:
- Exif
- XMP
- IPTC-IIM
- IPTC Core & Extension
- PLUS
- Dublin Core
There are others as well.
Originally by user62808. Source · Licensed CC BY-SA 4.0
user62808
9y ago
0
Generated from our catalog & community — verify before relying on it.
No. Keywords are not guaranteed to be stored in one single JPEG field.
Different programs may write metadata using different standards, and image files can contain more than one metadata block. Common metadata formats you may encounter include Exif, XMP, IPTC-IIM, IPTC Core/Extension, PLUS, and Dublin Core.
So while IPTC APP13 field 2:025 may contain keywords in some files, other software may store equivalent tagging data elsewhere. If you want reliable imports, your uploader should detect and parse the main metadata standards rather than assuming one fixed field.
In practice, the best approach is to read any keyword-related fields you support across the common standards and normalize them into your own tagging system after upload.
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AI9y ago
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