IPTC

The International Press Telecommunications Council released a metadata standard in 1990 that was to allow contextual information to be embedded within press photographs. The standard became known as the IPTC standard. IPTC focuses on information about the subject of the image rather than its physical attributes, thus it contains information such as keywords, copyright statements, location details and subject of the image. In general, the IPTC information is as relevant to any image derivative as to the master image.

IPTC metadata is stored in a similar format to that used for EXIF. IPTC has the concept of a broad category of attributes, known as a Record. Within a record a series of tags is used to specify individual attributes. IPTC defines nine Record values, however only 6 are used by images:

  1. Envelope (Envelope)
  2. Application (Application)
  3. News Photo (NewsPhoto)
  4. Pre Object Data (PreObjectData)
  5. Object Data (ObjectData)
  6. Post Object Data (PostObjectData)

As with EXIF the combination of a Record and Tag defines an individual attribute. The Record:Tag notation is used. Unlike EXIF however, IPTC does allow for repeat attributes, so attribute 2:25 (which is the keywords tag) may appear multiple times if more than one keyword is defined.

The tables below describe what tags are available on a Record basis. For a complete description of the values available for a given attribute, please consult the IPTC IMM Specification.