Image data is processed using a filter configured to compensate for degradation in an image that occurs when the image is printed by a printing unit. The degree of compensation for the degradation in the image by the filter depends on a printing direction on a printing medium by the printing unit.

A printing apparatus includes a reading unit to read a document image to generate image data, and a printing unit to print an image of the image data on a sheet supplied from any of multiple sheet storage portions. The printing apparatus determines whether an automatic selection function is enabled or disabled. The automatic selection function automatically selects, from among the sheet storage portions, a source for supplying a sheet that is used for printing. If the automatic selection function is enabled and a user specifies a predetermined sheet storage portion that has no sheet stored therein, the job execution instruction is not allowed. If the automatic selection function is disabled and a sheet storage portion that supplies a sheet for printing from among the plurality of sheet storage portions has no sheet stored therein, the job execution instruction is allowed.

A printer includes a receiver, a detector, and a sort controller. The receiver receives print data described in a page description language. The detector detects a predetermined specific command from the print data received by the receiver. If the detector detects the specific command, the sort controller performs control to sort a printout of a print data portion after the detected specific command from a printout of a print data portion before the detected specific command.

Provided is a printing device including a print data receiving unit, a page calculation unit that calculates a number of pages before stopping with using a page length of received print data and a distance from a printing mechanism unit to a visual recognition unit, a print instruction unit that changes the number of pages before stopping or a number of printed pages and performs print processing when the received print data corresponds to a control page for controlling printing, and a print stop unit that stops printing when the number of printed pages coincides with the number of pages before stopping.

A printing apparatus includes a first interpretation unit configured to generate intermediate data of a page by interpreting print data, a second interpretation unit configured to generate intermediate data of another page by interpreting the print data, and a controller configured to perform, according to a specific print setting command indicating that a specific process is to be performed on all pages, control such that the specific process is performed on all the pages. The controller performs the control if the specific print setting command is included in a specific page.

A printer is caused to perform duplex printing by an information processing device in which an OS standard printing program is installed. When causing a printer connected to a PC to execute duplex printing based on a print instruction output from an editing application installed in the PC, an auxiliary program that supports the printer executes rotation processing of rotating an image of a page, which is required to be rotated, by 180° for intermediate data received from a general-purpose print program, executes rearrangement processing of rearranging a processing order from a page order to a print order for print data received from the general-purpose print program, according to a sheet conveying aspect of the printer, and transmits the print data after the rotation processing and the rearrangement processing from the PC to the printer.

An image processing apparatus comprises a generation unit configured to generate, based on print data, pieces of information to be used for generating intermediate data based on the print data, and store the pieces of information in an external storage device connected to the image processing apparatus, and a rendering unit configured to generate the intermediate data using the pieces of information, and generate a raster image by performing rendering based on the generated intermediate data.

An image forming method using plural types of developers includes: step for performing a designation relating to a change of a type of developer to be used; step for inputting first image data including a first image of a first color that is different from the type of developer designated by the change of the type; step for receiving second image data including a second image of the first color that is designated; step of changing at least the first color of the first image data to a developer designated by the change of the type; and step for printing the first image data of which the first color is changed and the second image data expressing the first color without changing the first color on a same medium.

In a printer, a controller determines a type of print medium currently mounted in a mount portion, and acquires a first set of print data correlated with a first medium type and a second set of print data correlated with a second medium type. In a case that a print medium of the first medium type is mounted in the mount portion, a print portion prints a first print image based on the first set of print data, and thereafter prints a second print image based on the second set of print data. In a case that a print medium of the second medium type is mounted in the mount portion, the print portion prints the second print image based on the second set of print data, and thereafter prints the first print image based on the first set of print data.

An image forming apparatus includes a control circuit configured to determine whether one of an x-coordinate and a y-coordinate of a path specified in each of successive drawing commands for vector objects is the same, wherein the successive drawing commands are received in incoming printable data. The control circuit is further configured to execute, when there is a new successive drawing command for a vector object in which one of an x-coordinate and a y-coordinate of the path specified by the new successive drawing command is different from the x-coordinate or y-coordinate that has been determined to be the same for previously received successive drawing commands, all of the previously received successive drawing commands having the same x-coordinate or y-coordinate.