A printing system is provided with a dummy data insertion unit configured to insert dummy data into print data based on waiting time occurring when post-processing is performed by a post-processing device (for example, a collating machine). In a printing unit, a dummy page is printed on the basis of the dummy data. A dummy page removing unit configured to remove a dummy page from printed printing paper so that the dummy page is not supplied to the post-processing device is provided between the printing device and the post-processing device.

An image forming apparatus includes a memory, a control device, and an image forming device. The control device includes a processor and functions as a memory manager and a controller through the processor executing a control program. The memory manager allocates amounts of the memory depending on different types of processing constituting a job to create a plurality of memory regions. The controller executes the job using at least one of the plurality of memory regions. The image forming device executes an image forming job of forming an image on a sheet under control of the controller.

In an image forming apparatus, a scanning optical system forms on a photosensitive member N beam spots. Each beam spot scans along a scan line on the photosensitive member for one cycle. A center-to-center distance of any neighboring two beam spots is separated by M scan lines. M is a natural number larger than or equal to two. For each cycle, the memory controller reads adjacent sets of line data for N scan lines from the page memory, writes the adjacent sets of line data for N scan lines to the storage areas identified by a plurality of successive addresses of the line memory, selects addresses identifying storage areas storing unadjacent sets of line data having non-successive two scan lines separated by M scan lines; and outputs the unadjacent sets of line data stored in the storage areas identified by the selected addresses to the N laser emitting members.

An image processing apparatus comprises a first storage and a second, a plurality of image processing units that perform image processing on pixel data of image data read from the first storage or the second storage, and a writing unit that writes the pixel data, processed by the plurality of image processing units, into the second storage. The plurality of image processing units include a directivity image processing unit that performs image processing on the image data in mutually different directions by reading and supplying to an image processing unit of the plurality of image processing units the pixel data written into the second storage. Target pixel data processed by the directivity image processing unit is written into the second storage in an order of arrangement which is different from the order of arrangement of pixels in the image data stored in the first storage.

Instruction data is configured to include mode information indicating a print mode in download printing. The print mode includes a first mode and a second mode different from the first mode. The download printing includes: in response to extracting the mode information indicating the first mode, performing the download printing by the first mode, the first mode being a mode of, after completing reception of an entirety of a document, starting printing based on the entirety of the document; and in response to extracting the mode information indicating the second mode, performing the download printing by the second mode, the second mode being a mode of, before completing reception of the entirety of the document, starting printing based on a received portion of the document. The second mode is a mode in which reception of the document and printing based on the document are performed in parallel.

Instruction data is configured to include mode information indicating a print mode in download printing. The print mode includes a first mode and a second mode different from the first mode. The download printing includes: in response to extracting the mode information indicating the first mode, performing the download printing by the first mode, the first mode being a mode of, after completing reception of an entirety of a document, starting printing based on the entirety of the document; and in response to extracting the mode information indicating the second mode, performing the download printing by the second mode, the second mode being a mode of, before completing reception of the entirety of the document, starting printing based on a received portion of the document. The second mode is a mode in which reception of the document and printing based on the document are performed in parallel.

An image forming apparatus capable of coping with speedup of a printing operation without requiring a design change of a controller is provided. The image forming apparatus includes an image generating unit configured to generate image data, an image forming unit configured to control image formation based on the image data, a storage unit that is provided between the image generating unit and the image forming unit and temporarily stores the image data, a first connecting unit that connects the image generating unit and the storage unit and performs transferring of the image data at a first operating frequency, and a second connecting unit that connects the storage unit and the image forming unit and performs transferring of the image data at a second operating frequency higher than the first operating frequency. When a predetermined data amount is accumulated in the storage unit, the accumulated image data is transferred to the image forming unit.

An image forming apparatus includes a storage unit that stores a plurality of print jobs, an acquisition unit that acquires, when a desired print job is selected from the plurality of print jobs stored in the storage unit, a print setting of the selected print job, a determination unit that determines whether a print-cost-reducing print setting exists that reduces a print cost more than a print cost of the print setting acquired by the acquisition unit, and a changing unit that, if it is determined that the print-cost-reducing setting exists, enables changing the print setting of the selected print job to the print-cost-reducing print setting.

An image forming apparatus includes a sensor configured to detect an original, a nonvolatile storage that includes a semiconductor area, a setting unit configured to execute a setting for dividing the semiconductor area into a plurality of areas, and a controller configured to execute Trim processing on the divided areas in response to passing of a predetermined time period while the image forming apparatus is in a standby state. The controller is configured to stop the Trim processing based on a detection of the original detected by the sensor while the Trim processing is executed.

To use resources effectively and run appropriate processes in a configuration having multiple communication interfaces, a print control processor 201 switches a target buffer for processing data between a first receive buffer 24 that stores data received from a POS terminal 10, and a second receive buffer 26 that stores data received from a tablet terminal 13. The print control processor 201 controls a print mechanism 21 based on data stored in the receive buffer that is currently selected as the target buffer, changes the target buffer selection from the first receive buffer 24 to the second receive buffer 26 when control of the print mechanism 21 based on receipt print data stored in the first receive buffer 24 goes to a specific control state, and resets the target buffer selection to the first receive buffer 24 when control of the print mechanism based on the data stored in the second receive buffer 26 ends.