EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações descarregar pdf (Página 258)

CHAPTER 10: Scripting Access to XMP Metadata Accessing the XMP scripting API 258

Using the XMP scripting API

The XMPMeta object is the primary means of access to the namespaces and properties of an XMP

metadata packet. Through this object, you can create and delete namespaces and properties, and

examine and modify property values.

You can obtain or create an XMPMeta object

in several ways:

X You can use an XMPFile object to retrieve existing metadata directly from a file. The

XMPFile.getXMP() method creates an XMPMeta object, which you can use to examine or modify the

properties and their values. You can then use

XMPFile.putXMP() to write the modified metadata back

to the file.

X You can create an XMPMeta object with the constructor, initializing it with an XMP packet created or

obtained elsewhere.

X You can create a new, empty XMPMeta object with the constructor, and use its methods to create

entirely new namespaces and properties. You can then use

XMPFile.putXMP() to inject the new

metadata into a file.

In Adobe Bridge, you can pass XMP metadata between the built-in

Metadata object and the XMPScript

XMPMeta object

using serialized XMP.

X You can use XMPScript to examine thumbnail metadata by creating the XMPMeta object from the

metadata stored with a

Thumbnail object, using the object constructor. To ensure that the metadata is

up-to-date, use synchronous mode (which is off by default):

var thumb = new Thumbnail(new File("/C/myImage.jpg"));

app.synchronousMode = true;

xmp = new XMPMeta(thumb.metadata.serialize());

xmp = new XMPMeta(thumb.synchronousMetadata.serialize());

You can modify the metadata in an Adobe Bridge thumbnail by creating a new Metadata object with

serialized XMP. Continuing the previous example:

// create a compact XMP packet

newPacket = xmp.serialize(XMPConst.SERIALIZE_OMIT_PACKET_WRAPPER |

XMPConst.SERIALIZE_USE_COMPACT_FORMAT));

thumb.metadata = new Metadata(newPacket);

To write metadata back to the file for a thumbnail, you can access the thumbnail’s file and create an

XMPFile object

object to access the embedded metadata directly.

xmp = new XMPFile(thumb.spec.fsName, XMPConst.UNKNOWN,

XMPConst.OPEN_FOR_UPDATE);

NOTE: The XMPFile object does not support all of the file formats that Adobe Bridge supports.

Creating new metadata

This code creates an empty XMPMeta object

, uses it to set a metadata property, and serializes it to a string,

which you could pass to an authoring tool, for example, or store in a file.

xmp = new XMPMeta();

xmp.setProperty(XMPConst.NS_XMP, "CreatorTool", "My Script");

xmpStr = xmp.serialize(); // serialize the XMP packet to XML

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