Patent ID: 6765694
Filing Date: 2004-07-20
Classification: H04N

Abstract:
A color image processor comprising:an input circuit for entering a Raster command involving Raster Operation (ROP) codes and data about an image of multiple gray levels of plural colors; an UCR/BG circuit having UCR/BG functions of decomposing said image of multiple gray levels according to color materials of plural colors using said ROP codes, producing raster data to a buffer memory, and generating black; and a binarization circuit having a function of binarizing the raster data about each gray level and conveying the raster data into data about images each having one gray level; wherein:said input circuit receives said Raster command to produce a full-color image data for each different color, when an output image to be obtained is a multi-valued image, and said full-color image data for which black is generated by said UCR/BG circuit being rasterized into said buffer memory via a memory interface circuit; wherein:if an image to be obtained is not a rectangular image but a two-valued image, then said UCR/BG circuit performs black generation and UCR on raster data created by said input circuit, said raster data being successively rasterized into said buffer memory for each object, and a binarization operation being performed again for a rectangular range rasterized, when the rasterization into said buffer memory is completed.