To provide an image processing method, an image processing apparatus, an image forming apparatus, and a computer program which can obtain an excellent image without production of moire and worms even when adopting a simple gradation reproduction processing method.

A first discrimination section 162 compares a pixel value of a target pixel with a first factor different from the pixel value of the target pixel and stored in a first storage section 161 to discriminate ON / OFF of dots of the target pixel. A second discrimination section 165 uses pixel information of surrounding pixels in the vicinity of the target pixel and a second factor for specifying the acquisition of the pixel information and stored in a second storage section 164 to discriminate ON / OFF of dots of the target pixel. An overall discrimination section 166 totally discriminates ON / OFF of dots of the target pixel on the basis of discrimination results by the first and second discrimination sections 162, 65. No moire takes place because the same dither matrix is not repetitively in use unlike the dither method.