The image forming apparatus includes a control unit for converting image information into an image signal and output the image signal with reference to a timing signal, a sheet feeding control unit for feeding a recording material, an image forming unit for forming the image on a photosensitive drum based on the image signal output from the control unit, a transmission unit for transmitting a length of the image corresponding to a length of an output period of the image signal, an automatic sheet length detection mechanism for acquiring a length of the recording material in a conveyance direction thereof, and an image control unit for controlling a time interval at which the timing signal is output based on the size of the image and the size of the recording material.

An image forming apparatus includes a controller to execute a first mode for forming a toner image on a recording medium, in which a maximum toner carrying amount per unit area is a first maximum toner carrying amount, and a second mode for forming a toner image on the recording medium, in which the maximum toner carrying amount per unit is a second maximum toner carrying amount larger than the first maximum toner carrying amount. In the first mode, the controller sets a circumferential speed ratio of the toner bearing member against an image bearing member at a first circumferential speed ratio, and in the second mode the controller sets the circumferential speed ratio at a second circumferential speed ratio higher than the first circumferential speed ratio. The controller executes the second mode upon an order of the second mode by an operator.

An image forming apparatus includes a generation section, an image forming section, and a size determining section. The generation section divides a first image to generate a plurality of second images. The image forming section forms the second images on a plurality of sheets, respectively. The size determining section determines a size of a margin area allocated to at least one of the sheets. The image forming section forms the second images on the sheets, respectively, so that the second images are placed in a designated area on a combined sheet that is to be formed by combining the sheets. The size determining section determines the size of the margin area based on sizes of the designated area and the first image.

In accordance with an embodiment, an image forming apparatus comprises a reading section, a gradation conversion section and an image processing section. The reading section positioned at a back surface of a sheet which is a reading object is provided with a back surface part having a predetermined color at the back surface side of the sheet to read at least one surface of the sheet by using the back surface part as a background. The gradation conversion section executes a gradation conversion processing of enlarging a level difference in brightness at a highlight side on image data read by the reading section. The image processing section identifies an area of the sheet part and an area of the back surface part in the image data based on the image data to which the gradation conversion processing is executed.

An image processing apparatus includes a timing obtaining unit that obtains an interruption timing at which printing is interrupted in a printer that transports a printing medium in a first direction and performs printing on the printing medium, a division computing unit that arranges, at a position corresponding to the timing in a target area in which plural images are to be arranged, a virtual straight line extending through the target area in a second direction perpendicular to the first direction, an arrangement computing unit that separates and arranges the plural images in the target area divided by the virtual straight line into a first region downstream and a second region upstream in the first direction, and a data creating unit that creates and outputs, to the printer, first print data specifying the images arranged in the first region and second print data specifying the images arranged in the second region.

Provided is an image forming apparatus including an image bearing member, a developing device, a bias applying portion, a driving portion, a transfer device, and a controller. In a case where the length of the recording material is a second length larger than a first length, the controller controls the speed ratio of the driving speed of the developer bearing member to the image bearing member to be a second speed ratio larger than a first speed ratio and controls the residual developer amount born per unit area of the developer bearing member after the developing of the electrostatic image becomes a second developer amount larger than a first developer amount.

An image forming apparatus includes a generation section, an image forming section, and a size determining section. The generation section divides a first image to generate a plurality of second images. The image forming section forms the second images on a plurality of sheets, respectively. The size determining section determines a size of a margin area allocated to at least one of the sheets. The image forming section forms the second images on the sheets, respectively, so that the second images are placed in a designated area on a combined sheet that is to be formed by combining the sheets. The size determining section determines the size of the margin area based on sizes of the designated area and the first image.

The present disclosure provides an image forming apparatus configured to execute an image forming operation adequately while reducing a cumbersome work of a user of setting the sheet size. A processor of the image forming apparatus configured to execute a mode where the processor controls an image forming portion to form the image on the sheet even if the sheet size included in an image forming job is inconsistent with the sheet size stored in a storage portion. In such a mode, the processor controls a notification portion so as to give notification in a case where a size detection portion detects one of regular sheet sizes and where the sheet size included in the image forming job is inconsistent with the sheet size detected by the size detection portion.

An image forming apparatus includes: a document reading unit 110 allowing input of image data generated from a read document, a paper feed unit 140 containing recording paper, an image forming unit 120 forming an image on the recording paper based on the image data, and a touch-panel display 132 displaying a preview image representing a state of image formation. The touch-panel display displays a preview image in a designated orientation for a document of a prescribed size, and displays a preview image in accordance with size and orientation of recording paper fed from the paper feed unit, for a document not of the prescribed size. Thus, for documents of a prescribed size, preview images in a prescribed orientation can be displayed regardless of the direction of arrangement of the recording paper, and easier confirmation of expected finish of the formed image becomes possible.

There is provided a printing control device. A setting unit sets a sorting priority mode that causes a printing device to perform printing using a recording sheet in which the difference from the recording sheet size designated by a current print job mounted on the printing device is within a predetermined range, in a case where a recording sheet with a same size as the recording sheet designated by the current print job is not mounted on the printing device, and a recording sheet which has a recording sheet size that is printable without reducing the printing range, and for which the difference from the size of the recording sheet designated by the current print job is within a predetermined range is mounted on the printing device in a sheet feed direction different from the sheet feed direction of the recording sheet of the previous print job.