| 摘要 |
This specification discloses a method of and an apparatus for controlling electrophotographic images comprising the steps of detecting the contrast voltage between the surface potentials of the light and dark regions of an electrostatic image formed by the electrophotographic image formation process by taking the difference therebetween, modifying the charging conditions so that the detected contrast may assume a predetermined value, and realizing the substantial background region potential at a predetermined level which would not create fog when said electrostatic image is developed into a visible image, substantially without varying the modified contrast.
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