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Chapter 7. Transparency > Overview of Transparency

7.1. Overview of Transparency

The original Adobe imaging model paints objects (fills, strokes, text, and images), possibly clipped by a path, opaquely onto a page. The color of the page at any point is that of the topmost enclosing object, disregarding any previous objects it may overlap. This effect can be—and often is—realized simply by rendering objects directly to the page in the order in which they are specified, with each object completely overwriting any others that it overlaps.

Under the transparent imaging model, all of the objects on a page can potentially contribute to the result. Objects at a given point can be thought of as forming a transparency stack (or stack for short). The objects are arranged from bottom to top in the order in which they are specified. The color of the page at each point is determined by combining the colors of all enclosing objects in the stack according to compositing rules defined by the transparency model.


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