| 摘要 |
In an image forming apparatus which expresses lamp lighting energy corresponding to input gray scale data on the basis of on/off of lighting lamp of plural sub-dots corresponding to different lamp lighting times of different assistant scanning positions, with respect to such image that rapidly changes from a state close to white level toward a state close to black level, or with respect to such image that rapidly changes from a state close to black level toward a state close to white level, in order to decrease that a thin white stripe or a thin black stripe happens on the border portion, a random generator 34 and a adding circuit 33 are provided so that: whenever the gray scale value is inputted to the gray scale value input register 31, with respect to the lamp lighting energy, a random number of predetermined level is added. |
