Controlled Vocabulary

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What are the IPTC standards?
What's the difference between FFO or XMP?
Which IPTC fields should I use?
View the IPTC Core mapped fields PDF

View the Users Guide to the IPTC Core panels (PDF) on the IPTC website
What programs are there to edit IPTC Metadata?
Is there an easy way to view IPTC or other Photo Metadata?
Which IPTC fields do you suggest to use for stock photography image collections?
List of Software supporting IPTC photo metadata standards IIM and "IPTC Core"

The IPTC-NAA standards

Way back in the dark ages (OK, it was the 1970's) of image transmission, AP and other wire services actually sent images via machines that were little more than fancy fax machines. A black and white image was printed out line by line similar to how an inkjet printer of today works. Alongside the image would be typewritten information regarding caption, location source, crediting, etc. Typically the caption would either be cut off, or photocopied, and the two would go their separate ways. The text would be sent to editors, while the “photo” would go elsewhere for reproduction. If one or the other got lost or misplaced it would take valuable time to track it down and possibly mean missing a deadline. Obviously there had to be a better way.

Jump forward to today, where each image file can be saved using Adobe Photoshop with this text information embedded within the file. Anyone that's worked around newspapers, with digital images or image databases for a while has probably heard the acronyms IPTC or IPTC-NAA tossed around, usually when discussing the use of the File Info feature of photoshop. But few understand what they mean or what they stand for. The short story is that IPTC, the International Press Telecommunications Council, was one of the groups responsible for encouraging the standards necessary to“marry” the text information describing an image with the image data itself. The NAA is the Newspaper Association of America (formerly ANPA), and they also have been responsible for developing standards for exchanging information between news operations, including information used to describe images.

At this point, some of you are thinking,“OK that's enough about history, I'm doomed to repeat it, just show me how to use these IPTC “thingies” to help me find my images.” If that's the case, you may wish to jump to the chart of Sample IPTC fields below. If you need some help in figuring out how each of these IPTC fields actually appears in your version of Photoshop, download the IPTC Core mapped fields PDF. For those that want a little bit more background about how these standards came to be, read on.

A Brief History of the IPTC
Standards regarding metadata for news images have evolved over time, beginning in the 1970's when some were first issued as“guidelines.” However, most of these efforts were regional in nature, and focused on text. As news organizations moved from manual typewriters to CRTs (Cathode Ray Tubes) and VDTs (Video Display Terminals) these standards were revised and became more specific. Only later, as the world embraced the web, did the standards begin to address multimedia content.

In 1979, the International Press Telecommunications Council (IPTC) approved its first news exchange standard IPTC 7901. This provided metadata and content in plain text only; the only delimiters allowed were spaces and line breaks. Despite these limitations, IPTC 7901/ANPA 1312 is still in use. In the '80s, the IPTC and ANPA standards were revised, updated and expanded into other areas such as radio and broadcast television. As the '90s approached, these various groups focused their efforts on a new standard that could serve various media, not just text.

The IPTC/NAA “header(s)"
The Information Interchange Model (IIM) concept was launched in 1991, providing a new way to handle “digital resources” with metadata and content held in a binary structured framework. Around 1994 the “IPTC header(s)” are born when Adobe adds the ability to insert metadata information describing image content to digital image files. An Adobe specific container or “wrapper” encapsulated a subset of the IPTC’s IIM metadata structure, which could be edited using a Photoshop form.

Since that time, many third party developers have created software applications that are able to read and write to these “IPTC headers.” Some consider it metadata “black art” as there still can be issues with where this IPTC header information is stored within various image file formats; and there can be occasional glitches with how certain characters appear when exchanging files from Macintosh to Windows operating systems and vice versa.

Ch.. Ch... Changes (with File Info)
This IIM standard included entries for captions, keywords, categories, credits, and origins. The problem is, the IPTC/FILE INFO standard in Photoshop 4-6 didn't embrace the latest internet standard, XML (Extensible Mark-up Language) or RDF (Resource Description Framework).

XML is like HTML, but where HTML is mostly concerned with the presentation of data, XML is concerned with the “representation” of data. On top of that, XML is non-proprietary, operating-system-independent, fairly simple to interpret, text-based and cheap. RDF is the WC3's solution to integrate a variety of different applications such as library catalogs, world-wide directories, news feeds, software, as well as collections of music, images, and events using XML as an interchange syntax. Together the specifications provide a method that uses a lightweight ontology based on the Dublin Core which also supports the “Semantic Web” (easy exchange of knowledge on the Web).

IPTC goes XMP
That's probably one of the reasons why, around 2001, that Adobe introduced its XML based XMP technology to replace the “Image resource block” technology of nineties. XMP stands for“Extensible Metadata Platform", Adobe's mixture of XML and RDF. You may have noticed, if you ever saved out the file info data in earlier versions of Photoshop, that it was saved as an“.ffo” extension. The lastest versions of Photoshop (v7.01 and CS) use this XMP (eXtensible Metadata Platform). It is a labelling technology that lets users embed data about a file in the file itself, not just photoshop TIF and Jpeg images. It is currently supported in a number of Adobe applications and is available under an open source licence. In photoshop 7 and CS the file info is saved using the extension“.xmp” (signifying the use of XML/RDF). Photoshop 7 and CS differ a little in which IPTC fields are used. If you want to see how they compare to older versions of photoshop, or other IPTC compliant viewing or annotating utilities take a look at the old version of the IPTC mapped fields PDF. The new chart goes by the filename, "IPTC Core mapped fields PDF" and includes field mapping for the IPTC Core Schema for XMP, as well as for several new versions of imaging applications and databases.

What's going on now?
RDF is starting to be more widely adopted. For example the Dublin Core Metadata Initiative (www.dublincore.org/) is developing interoperable online metadata standards and work has been undertaken to encode the metadata in RDF (http://dublincore.org/documents/2002/04/14/dcq-rdf-xml/ ). A good comparison for how the Dublin Core metadata fields compare to the IPTC fields was on the Dartmouth University site: http://www.dartmouth.edu/comp/about/projects/digitalmedia/images/resources/metadata-schemas.html (now linking to the archived page on the Internet Archive's Wayback machine).

In early 2004, Gary Cosimini of Adobe gave a presentation on XMP at the IPTC Spring Meeting. Cosimini and Gunar Penikis of Adobe and Michael Steidl of the IPTC discussed how to best collaborate on a smooth transition of the old “IPTC headers” to the new XMP framework. In June 21, 2004, Adobe announced its collaboration with the IPTC, and in July 2004, a working group led by Penikis and Steidl is set up, and volunteers, including David Riecks of Controlled Vocabulary, are solicited as volunteers.

IPTC Core Schema for XMP
The "IPTC Core Schema for XMP" version 1.0 specification was released publicly on March 21, 2005. You can download the custom panels for Adobe Photoshop CS, as well as a full package that includes a comprehensive user guide to these panels (which I authored for the working group), example photos with embedded XMP information, the specification document, and an implementation guide for developers from the IPTC site.

In addition Riecks developed a set of "Video Tutorials" introducing the IPTC Core Schema for XMP, for which the Stock Artists Alliance (SAA) graciously provided webspace (scroll down to the list of five screencasts when you arrive at the site above). If you don't have Adobe Photoshop CS and want to learn more about the panels before downloading, this is a way for you to see them in action. These screencasts are Quicktime movies which are compatible with both Mac and Windows operating systems. Depending on your operating system, each file will need to partially or fully download before you can begin viewing. Expect a slight delay (30-40 seconds on broadband) before you can begin seeing a video.

See the new page on how to create Metadata Templates using the new IPTC Core.

IPTC Core 1.1 and Extensions 1.0 Released
The "IPTC Core Schema version 1.1 specification along with a new set of fields dubbed Extension 1.0 were released in June of 2008. These new fields in the Extension were developed by the IPTC Photo Metadata Working Group to address specific needs of the Stock Photography and Cultural Heritage communities. The IPTC Core updates are fairly minor by comparison. Custom panels for installing into the Adobe Creative Suite should be available in first quarter of 2009, along with a new User's Guide.

Which Fields should I use?
Depends, if you are working for a newspaper, they will want it one way, If for a magazine, perhaps another, the fields suggested for use with stock images are indicated in white on the chart of Sample IPTC fields at the bottom of this page.

Programs and Utilities for embedding IPTC info

Adobe PhotoShop (Mac, Windows)
http://www.adobe.com/products/photoshop/main.html

Captionwriter II (Mac OS 7.5+, Windows 95, 98, NT or 2000)
http://www.comnet-software.com/

FotoStation (Mac, Windows)
http://www.fotostation.com/

GraphicConverter (Mac)
http://www.lemkesoft.de/us_gcabout.html

Image Info Toolkit (Mac OSX, OS9.2, Windows 2000, XP) Read the Controlled Vocabulary Review
http://www.picturefinder.com/software/iit/welcome.html

IMatch (Windows)
http://www.photools.com/

iView MediaPro (Mac OS 9.2, OSX, Windows XP)
http://www.iview-multimedia.com

MediaGrid (Mac, Windows)
http://www.swcc.com/mediagrid2.html

Photo Mechanic (Mac, Windows)
http://www.camerabits.com/

Is there an easy way to view Photo Metadata?

You don't have to own a copy of the latest version of Photoshop in order to view the photo metadata (IPTC, Exif or XMP) within a digital image. Jeffrey Friedl has created a very useful tool that he calls Jeffrey's Exif Viewer which leverages Phil Harvey's ExifTool and makes it possible to view this image information through any web browser. To see how easy it is to use, view this short screencast of Jeffrey's Exif Viewer in action.

Sample IPTC Fields:
(suggested ones for stock images at top, optional fields are those on gray background)

IPTC Field Description Example Max Length (# characters)*
Description/Caption Long form description of Subject and related subject data in a Natural Language caption Dictator Simms addresses a crowd at the first futbol match of the season.....etc 2000
Keywords List of subject data by discrete words / phases POLITICIAN, DICTATOR, FUTBOL, SOCCER 64
Credit Line/Credit photographers name, agency name, etc Juanita Doe/Parador Times 32
Copyright photographers name, agency name, rights © Juanita Doe/Parador Times, all rights reserved 128

Title/Object Name**

similar to filename; may include unique identifier pe10102r 64
Date Created date image created 03/16/2003 16
Location location of image Parador Futbol Stadium 32
City location of image Chicacata 32
State/Province location of image Paranita 32
Country location of image Parador 64
Special Instructions list any restrictions, embargo, rights info MAGS OUT, INTERNET OUT, NO THIRD PARTY SALES 256
Creator/Byline Precise text of Byline © Juanita Doe/Parador Times 64
Category *** Category Code

(see ANPA Wire Categories below)

I = International 3
Headline Subject data, in short form Dictator Simms at futbol match 03/16/2003 256
Source provider of image Parador Times 32

 

*According to strict interpretation, some applications may allow for much longer entries, but you need to test to make sure additional data is not lost in other IPTC editors.

** Formerly known as the“slug” (keyword) field in the old standard, but expanded in newer versions.

*** This field has been expanded from the current single alphabetic character under NAARTNDA to a maximum of three, in common use under IPTC. It is likely, however, that many news agencies will continue the current practice of using one character in the NAA-RTNDA implementation of the standard and three characters in the IPTC implementation. Subject to agreement in North America, it may be possible to use the second character position for the RTNDA version of category codes where they differ from NAA. Like many datasets in the new standard, it can be repeated -- meaning a story can have more than one supplemental category. The American Newspaper Publishers Association (ANPA) wire category codes are available in PDF from from the Newspapers Association of America site (Google HTML version), or you can view a subset of them used by the Clarinet News Organization.

‡ The keyword field is a“multi-value” field. You can have unlimited numbers of keywords and phrases but no single keyword or key phrase can exceed this 64 character maximum limit.

 

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