Patent ID: 7835046
Filing Date: 2010-11-16
Classification: G06K

Abstract:
1. A data processing apparatus comprising: a first processing unit for executing composition processing based on ROP processing of data which have gone through color conversion processing for converting RGB multilevel data to CMYK multilevel data, halftoning processing for converting CMYK multilevel data to CMYK binary data and conversion processing for converting CMYK binary data to CMY binary data; a second processing unit for executing composition processing for RGB multilevel data, color conversion processing for converting the composite RGB multilevel data to CMYK multilevel data and halftoning processing for converting CMYK multilevel data to CMYK binary data; and a selector for selecting one of said first and second processing units by selecting said first processing unit when it is determined that a display list includes compressed background bitmap data generated during a period where a memory is insufficient and the composition processing is to be executed using background bitmap data, and by selecting said second processing unit when the display list does not include the compressed background bitmap data and for not selecting any of said first and second processing units when it is determined that the display list includes the compressed background bitmap data, but the composition processing is not to be executed using the background bitmap data.