Apple Aperture 2 - Manual (Page 289)

Chapter 11 Working with Metadata 289
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More Information About IPTC Metadata
If you intend to export your keywords as IPTC metadata, make sure each keyword entry
is no more than 64 characters long. Keyword entries longer than 64 characters may not
be displayed properly in other IPTC editors or operating systems.
Here are some examples of common character limits for IPTC fields.
IPTC field and character limit Description and example
Caption
2000 characters
A long-form description of the subject and related information in a
natural language caption.
Example: Mayor Alvarado addresses a crowd at the first soccer
match of the season.
Keywords
64 characters
A list of words describing the subject in discrete words or phrases.
Example: Politician, Mayor, Futbol, Soccer, News, Game, Team, San Jose
Credit
32 characters
Photographer’s name and/or agency name.
Example: Matthew Birdsell/Mercury News
Copyright
128 characters
Copyright date, photographer’s name, agency name, and rights.
Example: © 2003 Matthew Birdsell/Mercury News. All rights reserved.
Object name
64 characters
A unique identifier, used by an agency or organization to
catalog images.
Example: mt52642j
Created date
16 characters
Date the image was created.
Example: 05/16/2003
City
32 characters
City where the image was captured.
Example: San Jose
Province/State
32 characters
Province or state where the image was captured.
Example: California
Country
64 characters
Country where the image was captured.
Example: USA
Special instructions
256 characters
Applicable restrictions, rights, or embargo information.
Example: MAGS OUT, INTERNET OUT, NO THIRD-PARTY SALES
Byline
64 characters
The image byline text.
Example: © Matthew Birdsell/Mercury News
Category
3 characters
Applicable ANPA category codes.
Example: I (International)
Headline
256 characters
The headline published with the image.
Example: Mayor Alvarado Opens New Soccer Season in San Jose
Source
32 characters
The source that provided the image.
Example: Mercury News