Method and apparatus for generating halftone dots

摘要

The present invention generates a first threshold value constituting a first threshold pattern and a second threshold value constituting a second threshold pattern. The first threshold pattern is to reproduce a relatively large number of tones and is relatively small in size, while the second threshold pattern has a relatively small number of tones and is relatively large in size. An arithmetic operation is carried out on the first threshold value and the second threshold value so as to generate a third threshold value. The third threshold value is compared with an image signal to generate a dot signal representing a halftone dot.