An inkjet printing apparatus includes a mounting unit where a recording medium is mountable, a head unit that ejects ink droplets to the recording medium, a planar direction driving unit that drives at least one of the head unit ejecting the ink droplets and the mounting unit to move in a planar direction and that changes a relative positions of the head unit and the mounting unit in the planar direction, and a height direction driving unit that changes a relative positions of the head unit and the mounting unit in a height direction perpendicular to the planar direction. The planar direction driving unit has a moving speed changing mechanism that changes a carriage speed between the head unit and the mounting unit in the planar direction. The height direction driving unit has a distance changing mechanism that changes a distance between the head unit and the mounting unit.

In a state where a distance from an ejection port surface of an ejection head to a predetermined position corresponds to a first distance, a period detection unit detects a first period from when ejection of a droplet from an ejection port is started until when a droplet detection unit detects the droplet, and in a state where the distance from the ejection port surface of the ejection head to the predetermined position is changed to a second distance by a change unit, the period detection unit detects a second period from when ejection of a droplet from the ejection port is started until when the droplet detection unit detects the droplet, the second distance being different from the first distance. A calculation unit calculates an ejection speed of the droplet, based on the first distance, the second distance, the first period, and the second period.

There is provided a printer including: a carriage; a head; a position sensitive detector having a light-emitter and a light-receiver; and a controller. The head has: a first nozzle from which a printing ink is discharged, and a second nozzle from which a liquid scattering a light emitted from the light-emitter is discharged. The controller is configured to execute: formation of a scattering film on the object by discharging the liquid from the second nozzle onto the object; measurement of a distance between the head and the object, with the light emitted from the light-emitter and irradiated onto the scattering film; and adjustment, based on the measured distance, of a discharging condition of discharging the ink from the first nozzle, and performing printing on the object.

A printing apparatus prints an image by applying ink to a print surface of an inclined print medium using a print head. A control apparatus for the printing apparatus acquires information on an inclination of the print surface. Based on the information, printing is controlled according to a print condition corresponding to a magnitude of the inclination of the print surface.

The disclosed embodiments include a method to compensate for defective printer nozzles. The method can include detecting a defective printer nozzle and initiating a print job including image data of the defective printer nozzle for a pixel location of an image. The image is to be printed in accordance with a print mask that maps printer nozzles to pixel locations of the image. The method can include modifying the image to print the image data in a neighboring pixel location relative to the pixel location of the image and printing the modified image.

When an adjustment sheet is set on a recording surface of a medium, the adjustment sheet is transported together with the medium in a transport direction by a transport unit of a recording device. The adjustment sheet includes a first surface that contacts the recording surface, and a second surface that is a surface located opposite to the first surface and includes an adjustment region being a region in which an adjustment pattern detectable by a detection unit of the recording device is formed. A prescribed pattern has been formed in a region different from the adjustment region on the second surface.

There is a case where a reading unit cannot read an entire area of a recording medium in a scanning direction of a carriage, or a case where reading accuracy is low in the entire area. In such a case, a result of reading a test pattern for adjusting an ejection timing at each position cannot be obtained with high accuracy in a single reading operation. In order to solve the issue, a recording apparatus performs a reading operation a plurality of times and generates, based on results from the respective operations, an adjustment value for adjusting the ejection timing at each position in the scanning direction.

White-balance is improved when printing on colored media, while minimizing the time and use of costly materials required by present approaches. In an embodiment, the typical solid white fill or background layer is altered by including in the white layer one or more of the other colors already available in the printer to shade this layer. Thus, a small amount of cyan, for example, helps balance a pink-ish (red) media; yellow is used for blue media; and magenta is used for green media; as well as combinations thereof. A combination of transparent process inks and opaque white helps to maintain brightness (luminosity).

In an image processing apparatus, a processor sets a target printing method for printing a target image to one of a bidirectional printing method and a unidirectional printing method. In a case where the bidirectional printing method is set as the target printing method: the processor executes both a first generation process and a second generation process. The first generation process generates first partial print data by converting a set of partial image data using a first color conversion profile. The second generation process generates second partial print data by converting another set of partial image data using a second color conversion profile. In a case where the unidirectional printing method is set as the target printing method, the processor executes a third generation process generating third partial print data by converting a set of partial image data using a third color conversion profile.

A test pattern formation method includes preparing a first pattern including a plurality of dot rows that are separated, and a second pattern including a plurality of regions having a width greater than a width of the plurality of dot rows and provided spaced apart by a plurality of gaps greater than or equal to the width of the plurality of dot rows. At least a portion of the first pattern and at least a portion of the second pattern are in positions overlapping each other. Given a largest overlap between one of the plurality of dot rows and one of the plurality of gaps as a reference, the other dot rows of the plurality of dot rows and the plurality of regions having a wide width overlap and are deviated from each other incrementally by a respective distance corresponding to a landing deviation amount.