A rasterizer generates bitmap images of RGB on the basis of object data inputted from a printer driver and stores the result in an image memory. The rasterizer brings attribute information representing attributes of the input object data into correspondence with each pixel of the generated bitmap images...http://www.google.co.uk/patents/US7505174?utm_source=gb-gplus-sharePatent US7505174 - Image processing method, system and apparatus, and storage medium
