Patent ID: 8559083
Filing Date: 2013-10-15
Classification: G03G,H04N

Abstract:
1. An electrophotographic image forming apparatus that selects a screen from a plurality of screens corresponding to a plurality of gradation values to form a toner image on media, each of the plurality of screens including a pattern in which a first region and a second region are defined, the first region including a pixel that is a toner adhesion control target, the second region including a pixel that is not the toner adhesion control target, comprising: a storage unit for storing a first screen group and a second screen group, the first region expanding with increasing gradation value based on a first rule in the first screen group, the first region expanding with increasing gradation value based on an independent second rule different from the first rule in the second screen group; a screen selector for selecting the screen from the first screen group when the gradation value is smaller than a first threshold with respect to a unit region of an input image and selecting the screen from the second screen group when the gradation value is larger than the first threshold; and an image producing unit for performing image formation using the selected screen, wherein the screen selector relocates a first portion and a second portion such that the first portion and the second portion are joined by the second region that is not the toner adhesion control target, the first portion including the screen included in the first screen group, the second portion including the screen included in the second screen group, when the first portion and the second portion are adjacent to each other as a result of the selection of the screen in each unit region of the input image.