An image forming apparatus includes an image forming unit configured to form an image on a sheet, wherein the image forming unit includes: a photosensitive member; a charger configured to charge the photosensitive member based on a charging potential; an exposure unit configured to expose the photosensitive member charged by the charger to light to form an electrostatic latent image on the photosensitive member, an exposure intensity of the exposure unit being controlled based on an exposure condition; a developing sleeve configured to develop the electrostatic latent image; one or more processors configured to perform operations including: controlling the image forming unit to form a line test image and a width test image.

According to one embodiment, an image forming device includes a memory and a processor. The memory is configured to store an execution history of image processing and an adjustment history of the image processing. The processor is configured to detect an occurrence of an event based on a correlation between the execution history and the adjustment history, and to execute instructing to output information according to a detection result.

An image forming apparatus includes an image former that forms a color image by superimposing images of respective colors formed on respective different photoconductors on an intermediate transfer body, the image former continuously forming color images of pages on one continuous paper, and the image forming apparatus includes: a first hardware processor that performs job management for each color and generates print job data in which a margin region having a first width is set on an upstream or a downstream in a sheet passing direction of an image forming region of each page; a second hardware processor that detects a color shift amount of each color of the image forming region; and a third hardware processor that corrects a formation position of the image forming region to be a print target page next on the print job data for a color in which a color shift has occurred.

An apparatus and method for compensating for variation of the image placement for each color station in an intermediate transfer drum system. A sensor detects the image placed by the previous station and triggers the imaging on the drum such that it properly registered to the previous image. However, the variation of the drum’s radius results in runout which creates an error in the image placement, since the surface drum travel will be larger or smaller than expected. The method to correct for a lead edge offset for radial runout involves dividing the drum into regions and calculating an offset center of each region. As the drum transitions from region to region the offset value is updated to determine when to start imaging for proper placement on the sheet. The offset can be derived from the image runout to find the distance traveled from the transfer point or can be measured directly from color-to-color registration variation.

An image forming apparatus forms a color image on a recording medium by superimposing images of colors formed by image forming units. The apparatus includes a processor that: acquires a read image by reading the recording medium on which the color image has been formed; forms a register patch outside a job image forming region of the recording medium; and corrects image forming positions of the image forming units based on the read image that includes the register patch. The register patch includes: a leading end patch and a rear end patch formed with a reference color material; and one or more measurement target color patches formed with measurement target color materials between the leading end patch and the rear end patch. The hardware processor corrects the image forming positions based on relative positions of the leading end patch, the rear end patch, and the measurement target color patches.

An image forming apparatus includes an image bearing member, a transfer device, an applying portion; a detecting portion, a controller, and a receiving portion. The controller executes an operation in a setting mode in which during non-image formation, test images are transferred onto the recording material at different test voltages to the transfer device and then a transfer voltage applied to the transfer device during image formation is set on the basis of a detection result of the detecting portion. In a case that the operation in the setting mode is executed to set the transfer voltage for one-side mode, the receiving portion is capable of receiving instruction information selectively instructing a setting condition of the transfer voltage set by the operation in the setting mode from setting conditions including a first setting condition and a second setting condition.

An image forming apparatus includes an image forming device, a first transfer device including a first mover, a second transfer device including a second mover, a transfer-pressure changer, a detector, and circuitry. The detector detects a toner image and outputs a detection value indicating an amount of toner of the toner image adhering to the second mover. The circuitry calculates a variable value for the amount of toner varying with a change in a transfer pressure, based on the detection value and a target value of the amount of toner of the toner image to be transferred and adhere to the second mover, reflects the calculated variable value in the detection value to correct the detection value, adjusts an image-forming condition based on the corrected detection value, and sets the image-forming condition of the toner image in the image forming device based on the corrected detection value.

An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. An evaluation chart includes a first evaluation pattern, a second evaluation pattern, a third evaluation pattern and a fourth evaluation pattern. The first evaluation pattern includes a first dot row and a second dot row, and the third evaluation pattern includes a fifth dot row and a sixth dot row. The fourth evaluation pattern is formed by arranging a plurality of fourth evaluation patches. The fourth evaluation patch includes a seventh dot row and an eighth dot row.

An image forming apparatus includes a platen on which an original is to be placed, a feeder configured to feed an original placed on a tray, a sensor configured to detect a sheet on the tray, a lamp provided to the feeder, a reader configured to read the original placed on the platen and to read the original conveyed by the feeder, an image forming unit configured to form an image on a sheet, and a controller. The controller is configured to control the image forming unit to form a test image on a sheet, control the reader to read the test image formed on the sheet placed on the platen, control a density of the image to be formed by the image forming unit based on a reading result of the test image.

An image forming unit forms test images of a color of the same type as a first color using toner of a second color and toner of a third color, transfers first and second test images, fixes the test images on a sheet, controls a sensor to read the test images, determines sampling timings for the test images based on an output signal related to the first test image outputted from the sensor using a color filter of a fourth color, acquires a result of reading the test images based on a reading result of the test images on the sheet by the color sensor using a color filter of the first color and the sampling timing, and determines a transfer voltage based on the result of reading the test images.