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Sunday
Apr262009

What Image Metadata is Supported?

Introduction

Agencies usually require a Title, Description and Keywords for your images, and then additional categorization.  Unfortunately, categorization is not read from embedded image metadata, and while title, description and keywords are, there is no well-defined standard between software packages to record this information, nor is there a standard on the agency side as to which metadata field is read.

The short story is that we have taken the guesswork out of the equation so you never need to worry about seeing your images uploaded on a given channel, without the title/keyword information.  Simply use whatever software you currently use in your workflow to document your images and forget about having to set the title, description or keywords in multiple places - we're doing it for you!

Technical Details

Aperture, Photoshop, Paintshop or Windows (metadata changes through the file properties dialog) all record Title, Description and Keywords into different areas of your JPEG files.  For instance, Aperture uses the IPTC fields, while Photoshop uses XMP and Windows goes for IDF0.  Talk about jargon and messy one at that, right?!

In order to avoid the unhappy surprise that images appear without any information (or almost worse with different information!) once read by each channel site (they also read different fields!), we automatically synchronize the metadata fields as you upload your image.  This way, no mater your workflow, you can be assured your metadata is maintained and will travel as expected!

Because there are more or less widespread accepted standards on how this information should be recorded by software packages, we follow a precedence rule in case conflicting values are provided within your image.  For instance, if one of the Title field says "This is my first image" and the other states "This is my second image", clearly, one of those fields is wrong and we have to decide which field will be kept.

The following provides the technical details of which fields are read, in order or precedence:

Title

  1. IPTC:ObjectName
  2. XMP-dc:Title
  3. IPTC:Headline
  4. IFD0:XPTitle

Description

  1. IPTC:Caption-Abstract
  2. XMP-dc:Description
  3. XMP-exif:UserComment
  4. IDF0:XPSubject

Keywords

  1. IPTC:Keywords
  2. XMP-dc:Subject
  3. IDF0:XPKeywords

So, for instance, if IPTC:ObjectName states "My first image" while XMP-dc:Title states "My second image", your image will be corrected so that all four metadata fields indicate "My first image" in your iSyndica catalog, and as they travel to the various agencies.