PlanarImage that computes the result of this RenderedOp. The local OperationRegistry of this node is used to translate the operation name into a RenderedImageFactory and eventually an actual RenderedImage (usually an OpImage). During this method, all the sources supplied in the ParameterBlock are checked. If any of the sources is a RenderedOp, a rendering of that source is created. This propagates all the way up to the top of the op chain. If any of the sources is a Collection, then the collection is passed to the operation as-is. If there is a RenderedOp anywhere in the collection, it is up to the individual operation to create the rendering for that RenderedOp.
This method does not validate the sources and parameters stored in the ParameterBlock against the specification of the operation this node represents. It is the responsibility of the caller to ensure that the data in the ParameterBlock are suitable for this operation. Otherwise, some kind of exception or error will occur.
Invoking this method will cause any source RenderedOp nodes to be rendered using getRendering() and any source CollectionOp nodes to be rendered using getCollection(). Any DeferredData parameters in the ParameterBlock will also be evaluated.
The RenderedImage generated by the selected RenderedImageFactory will be converted to a PlanarImage by invoking PlanarImage.wrapRenderedImage().
@return The resulting image as a PlanarImage.
@throws RuntimeException if the image factory charged with renderingthe node is unable to create a rendering.
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