An inkjet printing apparatus uses a printing head including a plurality of nozzle arrays each including a plurality of nozzles arrayed in a first direction, the nozzle arrays being arranged in a second direction. A compensating unit compensates for an ejection failure of a defective nozzle by causing a compensating nozzle to eject ink to a predetermined pixel area in a case where the print data corresponding to the defective nozzle indicates ink ejection to the predetermined pixel area. The compensating unit determines the compensating nozzle such that the compensating nozzle satisfies both a first condition that the compensating nozzle is not a defective nozzle and a second condition that the print data indicates that nozzles belonging to the nozzle array including the compensating nozzle do not eject ink to a pixel area corresponding to N pixels (N is a positive integer) around the predetermined pixel area in the first direction.

Printing devices and methods are described. An array of ink nozzles can be arranged in a number of primitives, wherein a first primitive of the number of primitives is interdigitated with a second primitive.

In a control device, a controller is configured to perform: determining whether to print a target unit image according to J number of index values respectively corresponding to J number of target partial images; in response to determining to print the target unit image, controlling a printer to execute ejection processing and movement processing for printing a band image constituted with H number of successive unit images arranged in a sub-scanning direction and including the target unit image, the ejection processing ejecting a droplet of coloring material onto a printing medium while moving a print head in a main scanning direction, the movement processing moving the printing medium in the sub-scanning direction with respect to the print head; and in response to determining not to print the target unit image, controlling the printer to execute the movement processing but not execute the ejection processing for printing the target unit image.

A first output section outputs a first parameter calculated for each nozzle in a group obtained by dividing the nozzles into groups for each certain number so that density unevenness of ink ejected from each nozzle in the group is corrected. A second output section outputs a second parameter calculated for each group so that change rate of the density unevenness between groups is corrected. A first register circuit divides first parameters for each nozzle in the group and stores the first parameters. A second register circuit divides second parameters for each group and stores the second parameters. A multiplication section sequentially multiplies the first parameters by the second parameters. A conversion section converts a multiplication value to correction data of each nozzle. A setting section sets the correction data in a memory.

In a control device, a controller is configured to perform: determining whether to print a target unit image according to J number of index values respectively corresponding to J number of target partial images; in response to determining to print the target unit image, controlling a printer to execute ejection processing and movement processing for printing a band image constituted with H number of successive unit images arranged in a sub-scanning direction and including the target unit image, the ejection processing ejecting a droplet of coloring material onto a printing medium while moving a print head in a main scanning direction, the movement processing moving the printing medium in the sub-scanning direction with respect to the print head; and in response to determining not to print the target unit image, controlling the printer to execute the movement processing but not execute the ejection processing for printing the target unit image.

A printhead including one or more fluid vias in fluid communication with a fluid supply, each of the one or more fluid vias being associated with a first number of heating elements, the heating elements being divided into groups of a second number of heating elements so as to form a number of primitive groups, and an electrical interface having at least one shift register that receives primitive address data to allow for selective application of electrical signals to the heating elements so that fluid is ejected from the printhead in accordance with image data, the number of primitive groups being dependent on the print resolution of the printhead so that a number of bits required for the at least one shift register to address each heater is independent of the print resolution of the printhead.

An element substrate capable of suppressing occurrence of electromagnetic noise upon driving printing elements on an element substrate with long wiring lengths, preventing an operation error, and printing a high-quality image is provided. In the element substrate, plural element substrates each including printing elements are arrayed in an arrayed direction of the printing elements. Each element substrate including a wiring for supplying a driving power to drive the printing elements, and a ground wiring from the printing elements is configured as follows. Each element substrate includes a delay circuit for delaying a heat enable signal to drive the printing elements and supplying it to each printing element, and a switchover circuit for switching over, in accordance with a control signal, a delay sequence when supplying the heat enable signal to each printing element.

An image processing apparatus includes a controller for controlling a print execution unit. The print execution unit repeatedly performs ejection processing of ejecting a droplet of color material onto a printing medium. The controller is configured to perform: specifying an estimate value for a target partial image by using color gap information, the target partial image being selected among a plurality of partial images included in an N-th band image; determining whether the estimate value satisfies an estimate condition; determining an ejection execution direction with respect to an N-th ejection processing to be a first direction in response to determination that the estimate value satisfies the estimate condition; and determining the ejection execution direction with respect to the N-th ejection processing to be opposite to the ejection execution direction with respect to an (N1)-th ejection processing in response to determination that the estimate value does not satisfy the estimate condition.

A printhead including one or more fluid vias in fluid communication with a fluid supply, each of the one or more fluid vias being associated with a first number of heating elements, the heating elements being divided into groups of a second number of heating elements so as to form a number of primitive groups, and an electrical interface having at least one shift register that receives primitive address data to allow for selective application of electrical signals to the heating elements so that fluid is ejected from the printhead in accordance with image data, the number of primitive groups being dependent on the print resolution of the printhead so that a number of bits required for the at least one shift register to address each heater is independent of the print resolution of the printhead.

An image processing apparatus including a controller for controlling a print execution unit. The print execution unit repeatedly performs ejection processing of ejection droplet of color material onto a printing medium. The controller is configured to perform: specifying an estimate value for a target pixel image by using at least one pixel value corresponding to at least one of a plurality of pixels included in target partial data representing the target partial image, the target partial image being selected among a plurality of partial images included in an N-th band image and representing a part of an object; specifying an object type of the object; and determining an ejection execution direction with respect to an N-th ejection processing to be one of a first direction and a second direction according to the estimate value and the object type.