| 摘要 |
An image forming apparatus using a photosensitive body (1) having high gamma characteristics has an exposure unit that is provided with a radiation element whose exposure value is variably set and which is capable of blinking on a pixel-by-pixel basis. An exposure controller (6) is provided with an exposure pattern determining unit (7) that determines an exposure pattern according to the image pattern, and an exposure value switching unit (8) that switches between an exposure value A1 at which the potential of the photosensitive body (1) sharply attenuates and an exposure value A2 at which the potential of the photosensitive body (1) does not substantially attenuate, on the basis of the exposure pattern determined by the exposure pattern determining unit (7). The exposure pattern determining unit (7) is provided with an image area processor (9) that exposes image pixels to an intensive beam having the exposure value A1, and a smoothing processor (10 and 11) that exposes at least white pixels which are adjacent to the image pixels and are to be smoothed to a weak beam having the exposure value A2. |
