Technical Metadata for Digital Still Images
Originating from the Image Metadata Workshop in 1999, held by NISO (National Image Standards Organization), CLIR (Council on Library and Information Resources), and RLG (Research Libraries Group), the Technical Metadata for Digital Still Images schema was designed “to document image provenance and history (production metadata)” and “to ensure that image data will be rendered accurately on output (to screen, print, or film),” as well as aid in preservation.
The schema was influenced by the Digital Imaging Group’s DIG35 Working Group, the ISO Technical Committee 42 – Photography, and the Adobe Developers Association, and was spearheaded by Robin Dale and Günter Waibe as early as 2003. The literature was produced around 2005-2006 and the standard was approved by NISO and ANSI in 2011.
- This schema is meant to standardize digital image recording and thus “(allow) users to develop, exchange, and interpret” digital image files. It refers to TIFF (Tagged Image File Format) usage often and interprets/meets the DIG235 metadata standard.
- The Trial Use Period for this schema helped creators to learn that it would be used primarily in XML encoding
- Standards are to be broadly applicable
- No conflict should be found between metadata specified in the standard and file header metadata
- Definitions are to be “included in the individual clauses describing each element”
Basic element names
- Definition: definition in italics
- Type: specification allowable data type(s)
- Obligation: M = mandatory, MA = mandatory if applicable, R = recommended, O = optional
- Repeatable: Y = yes, N = no
- Values (examples): When data type = “enumerated type,” the values listed are actual values
When data type = “string,” examples are provided
- Notes: a comments field
- Use: System, Manager, User
The schema can be used with many data types (containers and elements) and describes images on many, many detailed layers. More information can be found here.