Patent ID: 8027063

Claim:
An image-forming apparatus configured to adjust a slope of an image in image information, the image-forming apparatus comprising: a first converter that corrects at least one image slope in one pixel units by converting a coordinate of the image; a second converter that corrects at least one image slope in less-than-one pixel units in a boundary where the first converter converts the coordinate of the image in one pixel units in a sub-scanning direction by changing, at each main-scanning position, gradation values to be assigned to a plurality of pixels at a same main-scanning position in the sub-scanning direction; an image-forming device that forms at least one toner image onto an image bearing member on a basis of image information corrected by the first converter and the second converter; a controller configured to form a test toner image including an intermediate gradation pixel using the image-forming device; a detector that detects a light reflection characteristic of the test toner image that is formed by the image-forming device; and an adjuster that adjusts gradation values to be assigned to a plurality of pixels at a same main-scanning position in the sub-scanning direction in accordance with an output of the detector.