Metadata Registry entries

When an image is added to the Multimedia module, metadata is extracted from the file and stored on the appropriate tab:

Tab

Supports
EXIF jpeg and tiff formats
IPTC jpeg, tiff, pict, ps and psd formats
XMP jpeg and tiff formats

The Metadata|Extract Registry entry controls what metadata is copied into EMu.

Whenever an image is derived from a master image in EMu (i.e. a different resolution of the master image), it is possible to copy some or all of the master image's metadata to the derived image. The Metadata|Embed Registry Entry controls what metadata is copied from the master image to the derived image(s).

Specify what metadata is copied from a master image to any derived images (resolutions) stored in EMu.

When derivatives are generated in EMu (via Multimedia>Generate resolution) this Registry entry is used to determine what metadata from the master image should be propagated to the derived image. The entry allows individual EXIF, IPTC and XMP properties to be selected or a whole section may be selected.

If the Registry entry is not set, no metadata is embedded.

Usage

This Registry entry can be assigned to users, groups and system-wide:

Key User Group Key System
Key 1 User Group Key 1 System
Key 2 user group Key 2 Setting
Key 3 Setting Key 3 Multimedia
Key 4 Multimedia Key 4 Metadata
Key 5 Metadata Key 5 Embed
Key 6 Embed Key 6 type
Key 7 type Key 7 format
Key 8 format    
Value tag;... Value tag;...
User user Setting Multimedia Metadata Embed type format tag;...
Group group Setting Multimedia Metadata Embed type format tag;...
System Setting Multimedia Metadata Embed type format tag;...

where:

type

is the type of metadata to embed. Allowable values are EXIF, IPTC and XMP.

format

defines the image format for which the metadata will be embedded.

There are three possible format types:

  1. A format of Default defines an entry for all image derivatives.
  2. An entry of JPEG or any other image type limits the entry to derivatives of the specified type.
  3. An entry of width:height:format further limits the entry to a particular derivative size and type.

    If the derivative matches the supplied width and height and is for the given image format, the metadata is embedded. For example, a value of 90:90:JPEG would indicate that the entry applies when generating a 90 pixel by 90 pixel JPEG image.

When determining which Registry entries apply for embedding tags in derivatives, EMu first looks for the third entry type (that is the most specific entry); if one is not found, it looks for the second entry type; otherwise the first. If an entry is not found, no tags are embedded in the derivative.

tag;...

The tag list depends on the metadata type selected. The list indicates what properties should be embedded in the derivative.

Allowable values are:

  • All

    All the metadata for the type (that is EXIF, IPTC or XMP) is embedded in the derivative.

  • None

    None of the metadata for the type is embedded in the derivative.

  • attribute

    The attribute value to embed in the derivative. The format of the attribute depends on the type of metadata being embedded. For EXIF data it is an IFD:tag pair; for IPTC it is a Record:tag pair; and for XMP it is a namespace:tag pair. If the tag part of the pair is left empty, all attributes for that grouping (IFD, Record or namespace) are included. An attribute may also have a preceding minus sign (-) implying the attribute should not be embedded.

In this first example the EXIF copyright property (attribute 1:33432) is to be embedded in all derived images:

Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Embed
Key 6 EXIF
Key 7 Default
Value 1:33432

If we want the EXIF copyright text copied into all images except for thumbnails (90 pixel by 90 pixel JPEG), the following two entries would be required:

Key Setting Setting
Key 1 System System
Key 2 Setting Setting
Key 3 Multimedia Multimedia
Key 4 Metadata Metadata
Key 5 Embed Embed
Key 6 EXIF EXIF
Key 7 Default 90:90:JPEG
Value 1:33432 None

The next entries will embed the XMP Dublin Core XML in derived TIFF and JPEG images:

Key Setting Setting
Key 1 System System
Key 2 Setting Setting
Key 3 Multimedia Multimedia
Key 4 Metadata Metadata
Key 5 Embed Embed
Key 6 XMP XMP
Key 7 TIFF JPEG
Value http://purl.org/dc/elements/1.1/: http://purl.org/dc/elements/1.1/:

Note: Notice how only the namespace is specified (it is important to have the trailing colon), indicating that all Dublin Core attributes should be embedded.

The next entry will embed all IPTC Application attributes (Record type 2) except for the MasterDocumentID and the UniqueDocumentID in all derivatives:

Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Embed
Key 6 IPTC
Key 7 Default
Value 2:;-2:185;-2:187

Finally, the following five entries will ensure that thumbnail images do not store any metadata. For all other derivatives all IPTC metadata is embedded, and for XMP, Dublin Core, IPTC and Rights data is embedded:

Key Setting Setting Setting Setting
Key 1 System System System System
Key 2 Setting Setting Setting Setting
Key 3 Multimedia Multimedia Multimedia Multimedia
Key 4 Metadata Metadata Metadata Metadata
Key 5 Embed Embed Embed Embed
Key 6 EXIF IPTC IPTC XMP
Key 7 Default Default 90:90:JPEG 90:90:JPEG
Value None All None None
Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Embed
Key 6 XMP
Key 7 Default
Value http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/; http://ns.adobe.com/xap/1.0/rights/: ;http://purl.org/dc/elements/1.1/:

If we assume the settings above and the XMP for the master image is displayed as follows:

then the derivative metadata would look like:

Specify what metadata is extracted from an image and stored in EMu.

EMu allows metadata to be extracted and placed into fields in the Multimedia module. Support for both atomic values and for tables of values is provided. Data from all supported metadata types (EXIF, IPTC and XMP) may be extracted.

Usage

This Registry entry can be assigned to users, groups and system-wide:

Key User Group Key System
Key 1 User Group Key 1 System
Key 2 user group Key 2 Setting
Key 3 Setting Key 3 Multimedia
Key 4 Multimedia Key 4 Metadata
Key 5 Metadata Key 5 Extract
Key 6 Extract Key 6 type
Key 7 type Key 7 format
Key 8 format    
Value tag;... Value tag;...
User user Setting Multimedia Metadata Extract type column tag;...
Group group Setting Multimedia Metadata Extract type column tag;...
System Setting Multimedia Metadata Extract type column tag;...

where:

type

is the type of metadata to extract. Allowable values are EXIF, IPTC and XMP.

column

is the name of the column into which the values are to be placed.

tag;...

The tag list depends on the metadata type selected. The list indicates what properties should be extracted for inclusion in the Multimedia repository.

The tag value is an IFD:tag pair for EXIF, a Record:tag pair for IPTC or a namespace:tag pair for XMP. If a list of tags is supplied, the first tag that has a value is used.

The metadata extracted will only be inserted into the specified column if there is no data already present in the field. It will not overwrite or add to existing data. When extracting metadata that has multiple values into an atomic field, EMu will join the values, separating them by a comma. When data is placed into a table column, values are broken on newline characters. Where an attribute is repeated (e.g. IPTC keywords attribute), each entry is placed in a separate row in the table.

This entry will extract the IPTC caption attribute (2:120) and add it to the Title field on the Multimedia tab:

Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Extract
Key 6 IPTC
Key 7 Multitle
Value 2:120

The next entry will extract the Dublin Core title attribute and place it in the Title field:

Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Extract
Key 6 XMP
Key 7 Multitle
Value http://purl.org/dc/elements/1.1/:title

The next entry will extract the keywords from the IPTC metadata (2:25) and place them in the Subject/Keywords list on the Details tab:

Key Setting
Key 1 System
Key 2 Setting
Key 3 Multimedia
Key 4 Metadata
Key 5 Extract
Key 6 IPTC
Key 7 DetSubject_tab
Value 2:25

Finally, the following three entries will try to extract the copyright details from EXIF, IPTC and XMP metadata and place them in the Rights field on the Details tab:

Key Setting Setting Setting
Key 1 System System System
Key 2 Setting Setting Setting
Key 3 Multimedia Multimedia Multimedia
Key 4 Metadata Metadata Metadata
Key 5 Extract Extract Extract
Key 6 EXIF IPTC XMP
Key 7 DetRights DetRights DetRights
Value 1:33432 2:116 http://purl.org/dc/elements/1.1/:rights;http://ns.adobe.com/xap/1.0/rights/:UsageTerms

Notice that the last entry looks up both the Dublin Core rights attribute and the XMP Rights Management usage attribute.

Note: When using the Update Resource tool for a selection of records (Multimedia>Update Resource), the metadata extraction Registry entries are not used. If, however, you update the current record (Multimedia>Update Resource>Current Record), the extraction does take place.

Additional details

Information for users about metadata is available here.

Information about each metadata standard supported by EMu, including the tags required for the Metadata Registry entries, is available here.