An image forming apparatus includes an image forming section, a receiving section, and a controller. The image forming section forms a plurality of images on a plurality of sheets. The receiving section receives a print job including a layout format indicating a layout of the images on the sheets. The controller controls the image forming section based on the print job. Each of the images indicates an image expressed by image data of a single page. The print job includes an instruction to form the images on the sheets according to a plurality of mutually different layout formats.

A printer includes a first printing unit responsible for one of preceding printing and subsequent printing that are to be performed on one sheet in overprinting, an other of the preceding printing and the subsequent printing being performed by a second printing unit; and a base-printing controller that causes the first printing unit to print a base for printing by the second printing unit in an operation of forming a test pattern for registration between the preceding printing and the subsequent printing on the sheet.

Whether there exists a side area image within side areas of the recording medium is determined. When it is determined that there exists no image within the side areas, a command is transmitted to a printer. The command causes a printer to start conveying of the recording medium at an earlier timing. The side areas of the recording medium are difficult to be heated by a heater arranged at a central portion of a fixing roller. Therefore, in order to heat the side areas, a long time for heating by the heater is necessary. When there is no image within the side areas, the heating time is shortened. Thereby, it is possible to start conveying the recording medium at an early timing, and a time period for completing a printing operation can be shortened.

An image forming apparatus includes an image bearing member, an image transfer device for transferring a toner image from the image bearing member to a sheet, an application device for applying a transfer voltage to the image transfer device, and a controller for controlling an output mode operation for outputting a predetermined chart in which test halftone toner images transferred with different transfer voltages are formed to adjust the transfer voltage. When outputting a maximum size of the chart, the controller forms the test toner images in a region within 50 mm from an edge in a width direction perpendicular to a feeding direction of the sheet.

An image forming apparatus includes a fixing unit, an image forming unit, and a controller. The controller is configured to receive image data corresponding to a target image to be formed on a sheet, convert the received image data to modified image data corresponding to a modified image that includes the target image and an added margin on at least one side of the target image in a sheet width direction side, control the image forming unit to form the modified image based on the modified image data, and cause the sheet to be conveyed to the image forming unit such that a positioning of the sheet in the sheet width direction overlaps with the target so that a fixing portion of the fixing unit overlaps with the target image in the modified image formed on the sheet.

An image forming apparatus includes a receiving part that receives multiple page images including a first page image and a second page image, a medium carrying part that carries the recording media, and an image forming part that forms images on the recording media carried by the medium carrying part based on the first and second page images processed by the image processing part. The image processing part determines one edge region of the first page image, which has the highest image density among four edge regions on the first page image, changes the orientation of the first page image such that the one edge region having the highest image density is arranged to be at the trailing side of the first page image, and changes the orientation of the second page image to the same orientation as that of the first page image.

An image forming apparatus includes a conveying device, an image forming device, a reading device, and control circuitry. The conveying device sequentially conveys a plurality of successive recording media that includes a preceding recording medium and a following recording medium. The image forming device forms an image on each of a front surface and a back surface of the preceding recording medium conveyed. The reading device reads an outer shape of the preceding recording medium. The control circuitry calculates an amount of deformation of the preceding recording medium based on the outer shape of the preceding recording medium read. The control circuitry corrects at least one of a front image and a back image based on the amount of deformation calculated, to cause the image forming device to form the front image and the back image on a front surface and a back surface, respectively, of the following recording medium.

An image forming apparatus includes a communication unit to acquire image forming data, generation units and to generate image data based on the image forming data, a correction unit to change an amount of correction to correct a shift of an image of the image data in forming the image in accordance with a ratio at which a developer is deposited by using the image data, and a printing unit to form the image corrected by the correction unit on a medium.

An image forming apparatus may include: a sheet storage that may store a sheet; a first sheet sensor that may determine a sheet size of the sheet stored in the sheet storage; a feeder that may feed the sheet from the sheet storage to a transport path based on the sheet size determined by the first sheet sensor; an image former that may form an image on the sheet fed to the transport path; a second sheet sensor that may (i) be provided downstream of the image former on the transport path, (ii) read the sheet in the transport path, and (iii) settle the sheet size of the sheet; and a hardware processor that may perform adjustment of image formation on the sheet based on the sheet size settled by the second sheet sensor.

A printer includes a first printing unit responsible for one of preceding printing and subsequent printing that are to be performed on one sheet in overprinting, an other of the preceding printing and the subsequent printing being performed by a second printing unit; and a base-printing controller that causes the first printing unit to print a base for printing by the second printing unit in an operation of forming a test pattern for registration between the preceding printing and the subsequent printing on the sheet.