IPTC IIM
Definition
International Press Telecommunications Council Information Interchange Model: a legacy binary metadata standard embedded in JPEG APP13. Carries caption, credit, copyright, and editorial classification fields. Predates EXIF and XMP but still present in many images processed through news or stock-photo workflows.
- Full name
- IPTC Information Interchange Model
- Format
- Legacy binary metadata block
- Location in file
- JPEG APP13 segment
- Typical fields
- Caption, credit, copyright, editorial classification
- Common context
- News and stock-photo workflows
Common questions
How does IPTC IIM differ from XMP metadata in the same image?+
IIM is an older binary block confined to a fixed set of editorial fields, while XMP is a newer XML-based format that can carry a wider range of extensible data, including edit history. Many editing tools write updated values to both blocks, and a mismatch between the two can itself be a useful forensic signal.
Why does IIM data still matter if XMP has largely replaced it?+
Some editing and asset-management tools continue to read or write IIM fields for backward compatibility, so caption, credit, or copyright values may survive in IIM even when a newer tool primarily uses XMP. Checking both blocks avoids missing provenance information that only one of them retains.
Related terms
- Makernote
- A proprietary EXIF sub-block written by the camera manufacturer to record device-specific data not covered by the EXIF standard. Canon, Nikon, Sony,...
- C2PA (Coalition for Content Provenance and Authenticity)
- An open technical standard that embeds cryptographically signed provenance assertions into media files at the point of capture or editing. A C2PA...
- Container Atom / Box
- The structural metadata units inside video container formats (MP4, MOV, MKV). Atoms such as mvhd (movie header) carry creation and modification timestamps;...
- EXIF
- Exchangeable Image File Format: a binary metadata standard defined in the IFF/TIFF structure embedded in JPEG APP1 segment and TIFF file headers....
- EXIF (Exchangeable Image File Format)
- A metadata standard embedded in JPEG and TIFF files by capture devices. EXIF fields record camera make and model, lens data, exposure...
- Moov Atom
- The master index atom in an MP4 or MOV file. Contains all track sample tables, timing information, creation and modification timestamps, and...
- RIFF Chunk
- Resource Interchange File Format: the container structure used by WAV and AVI files. A hierarchy of typed chunks, each with a four-character...
- XMP
- Extensible Metadata Platform: Adobe's XML-based metadata container embedded as a text packet in image files. Can carry all standard EXIF and IPTC...
- XMP (Extensible Metadata Platform)
- An Adobe-defined metadata format stored as an XML packet embedded in image files. XMP carries a software history field (xmpMM:History) that editing...
Explained in these topics
- EXIF and Container Metadata ForensicsA legacy text-based metadata format defined by the International Press Telecommunications Council for news-wire captioning. Carries caption, byline, keywords,...
- Metadata, EXIF, and File-Structure Forensics