1. A method of producing anti-aliased image data, comprising: loading a first sub-pixel sample pattern for use during rendering; rendering scene data using first pixel offset and the first sub-pixel sample pattern to produce first image data; loading a second sub-pixel sample pattern that is complementary to the first sub-pixel sample pattern; rendering the scene data using a second pixel offset and the second sub-pixel sample pattern to produce second image data; and combining the first image data and the second image data to produce an anti-aliased image of the scene data, wherein the first sub-pixel sample pattern is loaded into a first graphics processor, the second sub-pixel sample pattern is loaded into a second graphics processor, and the first graphics processor is configured to combine the first image data and the second image data.