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Chapter 7. Transparency > Transparency Groups

7.3. Transparency Groups

A transparency group is a sequence of consecutive objects in a transparency stack that are collected together and composited to produce a single color, shape, and opacity at each point. The result is then treated as if it were a single object for subsequent compositing operations. This facilitates creating independent pieces of artwork, each composed of multiple objects, and then combining them, possibly with additional transparency effects applied during the combination. Groups can be nested within other groups to form a tree-structured group hierarchy.

The objects contained within a group are treated as a separate transparency stack called the group stack. The objects in the stack are composited against some initial backdrop (discussed later), producing a composite color, shape, and opacity for the group as a whole. The result is an object whose shape is the union of the shapes of its constituent objects and whose color and opacity are the result of the compositing operations. This object is then composited with the group's backdrop in the usual way.


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