PURPOSE: To obtain an image forming device capable of improving the sharpness of an image generated from a color scanner, and a CG, font data, etc.

CONSTITUTION: This device is the image forming device with such feature that image density data from an image density data memory circuit 210 is read out by a readout circuit 22, and the image is discriminated by an image discrimination circuit 231, and when the image shows a character/dot, a remarked picture element is divided into small picture elements by an RE processing circuit 240, and after the RE processing by which the density of the remarked picture element is distributed corresponding to the distribution of neighboring picture element data including the remarked picture element is applied to the density of every small picture element, an image density signal is modulated by a triangular wave A based on a tripple clock DCK3 that is a reference wave by modulation circuits 26OA-26OC, then a pulse width modulation signal can be generated, and when the image shows a halftone image, the pulse width modulation of MTF-corrected image density data is performed by a triangular wave B based on a reference clock DCKo.