| 摘要 |
An image forming apparatus includes an image bearing member for bearing an electrostatic image, a plurality of developing units for accommodating developers having different colors, a light source for projecting light onto a developed image, and a photosensor for sensing reflected light from the developed image. The apparatus operates in either a first mode for determining the density of the developed image based on the output of the photosensor when light having a predetermined amount is projected from the light source, or in a second mode for determining the density of the developed image based on the amount of light projected from the light source when the output of the photosensor has a predetermined value. Either the first mode or the second mode is selected in accordance with the color of a developer being utilized during the image formation operation. |
