Ricoh Company, Ltd.

Taku Satoh

Takashi Kimura

Masakazu Yoshida

Toshihito Kamei

Yasunobu Takagi

Masanori Hirano

Shigetoshi Hosaka

Yoshiaki Hoshino

Makoto Tanaka

Yoshihisa Ohta

Shinichi Hatanaka

Shigetaka Sakakibara

Naoki Nakano

An image forming apparatus includes a first recording head including nozzles, each nozzle discharging liquid droplets, a second recording head including nozzles, each nozzle discharging liquid droplets, a detector to detect whether there is a non-discharging nozzle among the nozzles of the first recording head and the second recording head, the non-discharging nozzle being incapable of discharging the liquid droplets, and a controller to control at least one of the amount of the liquid droplet discharged from an adjacent nozzle to the non-discharging nozzle of the first recording head and the amount of the liquid droplet discharged from an adjacent nozzle to the non-discharging nozzle of the second recording head when the target landing position of the liquid droplet of the non-discharging nozzle of the first recording head is the same as the target landing position of the liquid droplet of the non-discharging nozzle of the second recording head.

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

An image processing method includes dividing a first image into regions according to content of the first image; generating a second image by converting a gradation of pixels of the first image into a gradation of pixels expressible in an image forming apparatus for each region; generating a piece of simulation information of a result of the image forming/outputting process based on the second image and nozzle characteristic information of the image forming apparatus; calculating an error between the first image and a third image for each of the regions, the third image being obtained by converting the piece of simulation information with the gradation of pixels of the first image; and deciding one of the second images as rendering information used to cause the image forming apparatus to perform an image forming/outputting process, based on the calculated errors between the first image and the third images.

Image processing method, computer-readable storage medium, and information processing apparatus for determining rendering information based on calculated errors between images

An image forming apparatus that performs correction to make gradation values adding both of two head areas (A+C, B+D) approximately equal. An area whose density is the lowest is set as a target density. Assuming densities for head areas A=70, B=100, C=40, D=90, head areas B and D are corrected with correction amount that &#x394;B become equal to &#x394;D (&#x394;B=&#x394;D=40) in accordance with target value (A+C=100).

Image forming apparatus, image forming method, and recording medium storing a 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 apparatus includes a recording head including a plurality of nozzles for ejecting recording liquid to perform image formation on a recording medium; and a correcting unit. The correcting unit is configured to divide the recording head by different division patterns each indicating that the recording head is divided into a plurality of segments by at least one different dividing point, correct input and output characteristics for each of the segments in each division pattern to calculate correction effect of the each division pattern, and determine one of the division patterns based on the calculated correction effects of the division patterns as a specified division pattern to correct input and output characteristics of the recording head.

Image forming apparatus, image correcting method, and computer-readable storage medium

An image processing apparatus includes: a color information acquiring unit that acquires color information of each scanning line of each head in a main scanning direction; and a correction unit that corrects a parameter used for a halftone process of a scanning line in the main scanning direction and a parameter used for a halftone process of an adjacent line adjacent to the scanning line, and, based on the acquired color information, corrects a difference in colors of the scanning line and the adjacent line.

Image processing apparatus, image forming apparatus, and image processing method

An image forming method includes discharging a droplet of a recording fluid via nozzles of a recording head onto a print medium; performing a main scan in which the print medium is scanned in a main scan direction; performing a sub-scan in which the print medium is scanned in a sub-scan direction; determining an overlap region in an image region that is formed by a single main scan; and performing an overlap control by forming an image in the overlap region through a plurality of main scans while the print medium is moved in the sub-scan direction by a feed amount L, wherein L=(n&#x2212;x)d&#x2212;md, where n is a number of the nozzles in the recording head; x is a number of the nozzles in the overlap region; d is a nozzle pitch; and m is a feed correcting coefficient (0&#x3c;m&#x3c;1).

Image forming method and image forming apparatus

An image forming apparatus performs a 1-pass recording by a single main scan with respect to a recording medium by a nozzle group including different overlapping nozzles that scan the same overlapping region on the recording medium to record dots. Alternatively, a multi-pass recording is performed by a plurality of main scans with respect to the overlapping region by the same nozzle group or by different nozzle groups. The recording in a central portion of the overlapping region is performed by placing emphasis on the succession or continuity of the dots, while the recording in boundary portions of the overlapping region is performed by placing emphasis on the scattering of the dots.

Image forming apparatus, image forming method and computer-readable storage medium

An image processing method is disclosed. A printer driver is a program for performing the method. The printer driver forms print image data that are printed by an inkjet recording apparatus capable of forming multi-level dots by ejecting droplets of recording liquid. The printer driver transforms image data of a manuscript into manuscript image data corresponding to the multi-level dots capable of being output from the inkjet recording apparatus by applying an image process such as a CMM process, a BG/UCR/&#x3b3; correction process, and a gradation process to the image data of the manuscript; further, forms the print image data corresponding to the multi-level dots capable of being output from the inkjet recording apparatus by combining the manuscript image data with data corresponding to the multi-level dots of an image pattern indicating that the manuscript is prohibited from being duplicated by a manuscript and tint block pattern combining section.

Image processing method, program thereof, image processing apparatus, and inkjet recording apparatus

A method of forming an image by an image forming apparatus provided with a print head having plural nozzles, wherein the print head has an overlapping area whose print area overlaps a print area of a physically adjacent print head, or has an overlapping area whose print area overlaps an adjacent scan line on a print sheet surface, includes an image forming step of forming an image by the print head, wherein the image forming step includes a control step of controlling in a variable manner an amount of ink sprayed from a proximity nozzle situated in close proximity of the overlapping area, the proximity nozzle being one of the nozzles situated in a non-overlapping area outside the overlapping area.

Formation of image by image forming apparatus with overlapping area

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

An image forming method is provided for use with an ink-jet printing device which forms a dot on a recording medium by ejecting a drop of recording liquid. In the image forming method, an image in which a ground tint is embedded in one of a foreground part and a background part of an original image is formed, the ground tint indicating that copying of the original image is inhibited. A recording liquid adhesion area of the dot per unit area in the foreground part is made different from a recording liquid adhesion area of the dot per unit area in the background part.

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Kanagawa, Japan

Taku Satoh