Ricoh Company, Ltd.

Shigetoshi Hosaka

Takashi Kimura

Masakazu Yoshida

Masanori Hirano

Naoki Nakano

Takahiro Ike

Toshihito Kamei

Yoshihisa Ohta

Taku Satoh

Takashi Mori

Naoki Kikuchi

Tomohiro Inoue

Naoya Morohoshi

Michio Umezawa

Yoshiaki Hoshino

Shigetaka Sakakibara

An image forming apparatus includes carriages each carrying a liquid discharge head and circuitry. The circuitry acquires divided print data having a size extended in a direction corresponding to a conveyance direction of a recording medium from a size corresponding to a length of a nozzle array of the liquid discharge head in the conveyance direction; identifies, for the liquid discharge head of a particular carriage, from the divided print data, a shifted data portion having a size corresponding to the length of the nozzle array and being shifted by a number of pixels corresponding to an amount of deviation from a target installation position of the particular carriage in the conveyance direction; controls the liquid discharge head to discharge ink to the recording medium using the shifted data portion; and controls the particular carriage to move in a main scanning direction based on the shifted data portion.

Image forming apparatus, image forming system, image forming method, and non-transitory recording medium

A liquid discharge apparatus includes: an applicator configured to apply a first liquid onto a surface of a fabric medium to increase repellency of the surface of the fabric medium; a head configured to discharge a second liquid onto the surface of the fabric medium, onto which the first liquid has been discharged; a detector configured to detect the repellency of the surface of the fabric medium on which the first liquid has been discharged; circuitry configured to: determine whether the repellency detected by the detector is equal to or larger than a predetermined repellency; and control the applicator to further apply the first liquid onto the surface of the fabric medium in response to a determination in which the repellency detected by the detector is lower than the predetermined repellency.

Liquid discharge apparatus and liquid discharge method

An image forming method is provided that includes discharging, from a liquid discharged head, a white ink onto a recording medium to form a first layer having a first width, and a color ink onto the first layer to form a second layer having a second width. When the second width is equal to or smaller than a threshold, the first width is equal to the second width, and when the second width is larger than the threshold, the first width is smaller than the second width.

Image forming method and image forming apparatus

Provided is an image forming method including an image forming step of discharging liquid droplets of an active-energy-ray-curable ink onto a base to form a liquid-droplet film and irradiating the liquid-droplet film with an active energy ray to form a cured film, to form a laminated cured product in which the cured film is laminated on the base, wherein an elongation rate of the laminated cured product obtained according to a formula below is 60 percent or greater.Elongation rate=[(length after tensile test&#x2212;length before tensile test)/(length before tensile test)]&#xd7;100 Length before tensile test is a length of the laminated cured product obtained by laminating the cured film on the base to have an average thickness of 30 &#x3bc;m, and length after tensile test is a length of the laminated cured product after elongated with a tensile tester at a tensile speed of 20 mm/minute at 180 degrees C.

Image forming method, image forming apparatus, and laminated cured product

An image processing method generates image data of an image made up of a plurality of dots and having resolution in a first direction and resolution in a second direction. The second direction intersects the first direction. The resolution in the first direction is different from the resolution in the second direction. The image processing method includes performing contour portion correction including adding a dot at a correction target pixel, the correction target pixel being a pixel adjacent to a step-like contour portion in the image, and when a dot is arranged at a pixel adjacent to a pixel of interest adjacent to the correction target pixel, deleting the dot at the pixel of interest.

Image processing method, image processing apparatus, and computer program product

An image processing apparatus includes an input unit that inputs printing information containing image data and a conversion unit that, when the pixel value of the top pixel from among successive N pixels (N is an integer equal to or larger than 2) of the image data is a specific value, sets a pixel having a pixel value that is not the specific value as a new top pixel from among pixels from a pixel adjacent to the to pixel to the N-th pixel, refers to data of the new top pixel to the N-th pixel, and performs a conversion into pixel values that are calculated with coefficient values according to the magnitude of the pixel values.

Image processing apparatus, image processing method, and computer-readable recording medium, for converting resolution of image

An image forming apparatus includes an image forming device, a threshold comparator, a first image compensator, and a second image compensator. The first compensator executes a processing of, for at least a pixel value less than a threshold, setting a value of stopping discharge of a droplet from a defective nozzle in converting multi-valued data of an input image into n-value data, and spreading a quantization error due to setting the value, to neighboring pixels of a pixel corresponding to a defective nozzle. The second compensator executes a processing of replacing a smaller dot among dots around the defective nozzle with a larger dot by pattern matching using a mask pattern in accordance with a dot size and placement around the defective nozzle, on condition that as a result of comparison of the comparator, the pixel value corresponding to the defective nozzle is equal to or more than the threshold.

Image forming apparatus, image processing method, and program recording medium

An image forming apparatus shifts dots of a recording dot pattern by half of a dot pitch in a main scanning direction to generate a shift dot pattern, corrects a jagged outline of the shift dot pattern caused by shifted dots using correction dots to generate a corrected shift dot pattern, and determines an increased number of ink droplets to be additionally ejected from one or more of a plurality of nozzles to form the shifted dot or the correction dot of the corrected shift dot pattern with an increased dot size, based on an estimated shift value indicating the displacement in landing position of ink droplets forming the dot of the recording dot pattern.

Apparatus, system, and method of forming image using inkjet printing, and recording medium storing inkjet printing control program

A disclosed image processing apparatus performs an image processing operation to execute double-side printing on both sides of an image forming medium. The image processing apparatus forms a dot font including a dot pattern of a character in a character image that has undergone a halftone process using a predetermined coefficient for mitigating show-through when the double-side printing is performed; forms a correction dot for making a correction to reduce step-like irregularities along an outline portion of the character in the character image, which correction dot is formed based on an arrangement position, a color, and a dot size of the correction dot for reproducing a gradation that has undergone the halftone process using said predetermined coefficient; and combines the dot font and the correction dot.

Image processing apparatus to correct an image during double-sided printing

An image forming method is disclosed in which an image is formed on commercial printing paper using a high penetration pigmented ink by performing image processing which makes use of dot patterns corresponding to an output halftone level.

Image processing method, program, image processing apparatus, image forming apparatus, image forming system

An imaging apparatus is disclosed that includes plural heads that are arranged in a main scanning direction, the heads including plural nozzle arrays that are arranged in the main scanning direction and configured to discharge droplets of recording liquids in at least three different colors including a yellow recording liquid. At least two of the nozzle arrays that are configured to discharge the yellow recording liquid are separately arranged in at least two of the heads. At least two of the nozzle arrays that are configured to discharge a first recording liquid of the recording liquids in a first color other than yellow are arranged together in one of the heads. At least two of the nozzle arrays that are configured to discharge a second recording liquid of the recording liquids in a second color other than yellow are arranged together in one of the heads.

Color imaging apparatus having yellow nozzle array and magenta nozzle array on same head and shifted relative to each other by a half-pitch

An image processing method configured to produce image data output from an image forming apparatus configured to form an image by using a recording head composed of a liquid ejecting head having plural arranged nozzles configured to eject a liquid drop and an energy generating device configured to generate ejection energy corresponding to each nozzle while conducting a halftone processing configured to covert input image data to an N value which is less than a tone (M value) thereof (N value: M&#x3e;N&#x2267;2) is provided, wherein a halftone processing configured to substantially reduce a driving frequency of a driving wave pattern applied to the energy generating device is conducted when a liquid drop with a drop size causing ejection irregularity or a liquid drop from a nozzle causing ejection irregularity is ejected.

Image processing method, program, recording medium, image processing device, and image forming apparatus

A disclosed inkjet recording apparatus for performing recording by jetting a recording liquid onto a recording medium includes an image processing unit configured to obtain an output halftone level by performing halftone processing on input image data, to select a dot arrangement order according to the obtained output halftone level, and thereby to generate dot data where dots are arranged in a grid-like pattern. The disclosed inkjet recording apparatus is configured to use a pigmented ink as the recording liquid when the recording medium is a commercial printing paper, and to record the dots in a staggered arrangement where positions of the dots in odd/even-numbered columns or odd/even-numbered rows in the dot data are shifted in a sub-scanning direction or in a main-scanning direction.

Inkjet recording apparatus, image processing method, storage medium, pigmented ink, and recorded matter

A disclosed dither matrix is used in halftone processing for converting input image data having M input halftone levels into output image data having N (M&#x3e;N&#x3e;2) output halftone levels. In the halftone processing, a concentration type dither matrix is used as the dither matrix when an input halftone level is within a range of input halftone levels corresponding to an output halftone level that is lower than a predetermined threshold level T (N&#x3e;T&#x3e;1), and a dispersion type dither matrix is used as the dither matrix when the input halftone level is within a range of input halftone levels corresponding to an output halftone level that is equal to or higher than the predetermined threshold level T.

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Kanagawa, Japan

Shigetoshi Hosaka