IMAGE PROCESSING METHOD AND IMAGE PROCESSING APPARATUS

摘要

In low-resolution processing (reduction processing) in which input image data is separated into character print data and image print data to generate print data of lower resolution than that of the input image data, if a plurality of pixels is simply reduction-processed to one pixel, color of a color image surrounding a character may change. In an image processing method, calculation for performing reduction processing so that the plurality of pixels in the input image data corresponds to one pixel in the print data is performed as follows. A ratio of using a pixel value of a character attribute pixel in the calculation is set to 0, or set smaller than a ratio of using a pixel value of an image attribute pixel. As a result, a change in the color of the color image surrounding the character can be prevented.

主权项

1. An image processing method for generating, based on input image data for printing on a predetermined region of a printing medium an image including an object of a character attribute and an object of an image attribute, print data which is of lower resolution than that of the input image data according to the predetermined region, the method comprising:
obtaining attribute information on each of a plurality of pixels in the input image data, the plurality of pixels corresponding to a target pixel in the print data; and determining a value of the target pixel in the print data by using a value of a pixel on which the attribute information indicates the image attribute, among the plurality of pixels in the input image data, at a higher ratio than a value of a pixel on which the attribute information indicates the character attribute.