Overview
ISO 12234-3:2016 - "Electronic still picture imaging - Removable memory - Part 3: XMP for digital photography" defines an XMP namespace and standard metadata definitions for digital photography. The standard specifies how photographic metadata should be expressed using the XMP data model and XML serialization for reliable interchange. It is independent of image file format and can be embedded in files or used in external image metadata databases to improve searchability, processing, printing and rights management.
Key topics and requirements
- XMP namespace and mapping: specifies a dedicated XMP namespace for digital photography metadata and unambiguous mappings of common photographic properties into XMP.
- Metadata definitions: standardizes meaning and value types for many photographic properties (examples in the standard include ApertureValue, Artist, CameraOwnerName, CFAPattern, ColourEncoding, Copyright, DateTimeOriginal, GPS, FocalLength, LensModel, Orientation, ShutterSpeedValue, Software, UserComments, Faces, Favorites, and more).
- Reference model and usage: describes a reference model for encoding, exchange and extensions of metadata using the XMP data model and XML serialization.
- Format independence: designed to be used inside any image file format or in separate metadata stores; normative annexes show use with Exif, TIFF/EP and JPEG 2000.
- Value types and forms: defines how values and lists are represented in XMP (see Annex D for value forms and types).
- Normative interoperability: aligns with related standards (e.g., ISO 16684-1 XMP specification) and normative references for date/time and imaging measurements.
Applications
- Improved search and asset management in photo libraries and digital asset management (DAM) systems by providing consistent metadata fields.
- Interchange of metadata between cameras, photo-editing and publishing software, online photo services and archives.
- Workflow automation: enabling processing and printing tools to read standardized picture-taking parameters (exposure, lens data, GPS) for optimized handling.
- Rights and provenance: consistent embedding of copyright, artist and ownership metadata for licensing and archival purposes.
- Use cases include camera manufacturers, image software developers, photo lab systems, stock photo platforms, archivists and metadata specialists.
Who should use this standard
- Camera and imaging device manufacturers implementing metadata in removable memory or files.
- Software developers of photo editors, DAM systems and web photo services.
- Archivists, photographers and organizations managing large image collections requiring interoperable metadata.
Related standards
Keywords: ISO 12234-3:2016, XMP for digital photography, digital photography metadata, XMP namespace, metadata definitions, Exif, TIFF/EP, JPEG 2000, image metadata interoperability.
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