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Topic: 1.4 spec - compositing
Conf: (P-PDF) Developers, Msg: 51102
From: ebroadbent
Date: 5/29/2002 04:43 PM

Does anyone know how to interpret the "group alpha", "group shape" and "group color" as referred to in section 5.3 of the 1.4 spec? It is difficult to determine how a single value for alpha, shape and color (per channel) can be attributed to an object that can have varying backdrops, depending on what object(s) it overlays. The spec seems to allow for shape, alpha, and color to vary by position but it explicitly says that the result of the group compositing function is a single value for each that applies to the whole composited object. This seems to say that whatever the topmost composited values are apply to the whole group, regardless of whether the entire geometry has been composited with the same source and backdrop values. I don't get it.

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