There are two compositor component types defined for compositing of two input RGBA (or one RGBA and one RGB) data sources. The defined components are:
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RGB Compositor: This component accepts two RGBA inputs (with one Alpha input optional) and composites the data into a single RGB output. Each item of Presentation State Compositor Component Sequence (0070,1805) specifies one RGB Compositor component:
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RGBA Compositor: This component accepts two RGBA inputs and composites the data into a single RGB output and a single Alpha output.
