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From Odwiki

During rendering, shaders are executed when necessary and this information is known as a shading sample. After rendering all the shading samples necessary to complete the view of the scene, these samples are combined according to a compositing scheme and the final 2d raster image is generated.

The PixelFilter has an influence on the primary colour output image and , together with the SampleFilter will determine how samples for the DeepRaster layers will be combined.

This is true for Mantra and most other renderers in some form or other; for instance REYES style renderers such as PrMan.