Adobe Smoke Alarm CS3 Manual De Usuario

 Photoshop CS3 Scripting Basics     10

a new document, add a layer to an existing document, or change the background color of a layer. Most of 
the functionality available through the Photoshop CS3 user interface is available through the DOM. 

A good understanding of the Photoshop CS3 DOM, and how each aspect of the DOM relates to the 
Photoshop application and its documents will make script writing easier. 

The Photoshop CS3 object model is a containment hierarchy, which means that objects in the model are 
identified partially by the objects that contain them. In Photoshop CS3, the 

Application

 object sits at the 

top of the hierarchy. Applications contain a Documents collection. The Documents collection contains 
Document objects. A Document object contains an ArtLayers collection, a HistoryStates collection, a 
Layers collection, a Layersets collection, and a Channels collection. Through using commands or methods 
in the DOM, you can tell Photoshop CS3 documents to add and remove objects, or set or change 
individual object properties like color, size and shape. In the diagram below, each node in the hierarchy 
represents a class in the Photoshop CS3 DOM.

The Photoshop CS3 object model uses elements (AppleScript) or collections (VBScript, JavaScript) as a 
convenient way to group classes. We have not shown object elements or collections in the object model 
diagram below. Not all classes are associated with a collection. However, some key classes are grouped by 
elements or collection. The following elements/collections exist in Photoshop CS3: 

Art Layers

, 

Channels

, 

Color Samplers

, 

Count Items

, 

Documents

, 

Layers

, 

Layer Comps

, 

Layer Sets

, 

History 

States

, 

Notifiers

, 

Path Items

, 

Path Points Sub Path Items

, and 

Text Fonts

. See Introduction to 

Scripting for more information on elements and collections.

In Photoshop, VBScript collections index from 1 rather than 0. This stands in contrast to other 
VBScript arrays, which index from 0.

.