Patent ID: 6437872
Filing Date: 2002-08-20
Classification: G06K

Abstract:
A rendering apparatus that renders page description language documents for printing by a high addressable printer, the documents having at least one of a fully toned object and a partially toned object, the apparatus comprising:a page description language interpreter having an input section and an output section, the input section receiving a document representing a page to be printed, the document being formatted in a page description language; means within the interpreter for distinguishing a partially toned object and a fully toned object; means for processing a fully toned object and outputting the fully toned object as fully toned object data in a predetermined output format; means for screening the partially toned objects to obtain multibit deep partially toned data in a predetermined format, which includes means for determining a threshold pattern array at a given addressability; means for calculating sub-pixel thresholds from the threshold pattern array; means for screening by comparing an input signal against the sub-pixels to achieve multibit deep screening; and means for sending the fully toned object data and the halftone data to a printer for subsequent printing by a high addressable printer.