Riso Kagaku Corporation

Mitsuaki Ishitoya

Yoshiyuki Okada

Takashi Ebisawa

Junichi Hakamada

Tsutomu Kurose

Takahiko Nakamura

Kenji Oshima

Kouichi Nobushima

Noriaki Nagao

Michael Mehigan

Shoichi Miyata

Tadakazu Yokoyama

Koichi Nobushima

Jianmin Xiong

Nami Higashio

An image processing apparatus performs operations including: when a density value of a black component in uncorrected monochrome image data corresponding to each of pure colors including primary colors and secondary colors in color image data is lower than a reference density value, the uncorrected monochrome image data being obtained by a monochrome conversion from the color image data to monochrome image data, determining a correction content for correcting the density value of the black component in the uncorrected monochrome image data corresponding to at least each of the pure colors out of the pure colors and peripheral colors of the pure colors in a color space to a value equal to or higher than the reference density value; and obtaining corrected monochrome image data in which correction based on the determined correction content is reflected in the uncorrected monochrome image data.

Image processing apparatus for monochrome conversion and image forming apparatus including the same

An image processing device includes a print image data generator and a density adjuster. The print image date generator generates print image data for each of colors to be used to print a document image from image data of the document image including a barcode image and a background image overlapped on the barcode image as a background. The density adjuster performs at least one of processing to reduce the density of the barcode image in at least any one of pieces of the print image data of colors including the barcode image and processing to reduce the density of the background image within a neighboring region that neighbors a bar of the barcode image in at least any one of pieces of the print image data of colors including the background image.

Image processing device and image processing method

A specific gamut of colors extending a reproduction range of colors in a color space is set to make for any ink color belonging to the specific gamut a conversion from CMYK dot pattern data into numbers of ink drops to be discharged from an inkjet head, using as a lookup table an extended pattern table having a maximal drop number '7'. For ink colors belonging to a gamut of colors outside the specific gamut, a default pattern table having a maximal drop number '5' is used as a lookup table for the conversion from CMYK dot pattern data into ink drop numbers.

Printing method and printing processor for color images

A printing device includes a barcode area dividing unit that divides a barcode area of a printing sheet into plural division areas along a Y direction, and a barcode area ejection amount conversion and output unit that controls an ink jet printing unit to print black bars such that an X direction is a direction in which the black bars and white bars are alternately arranged and occupancy dimensions of ink of pixels are different in the division areas divided by the barcode area dividing unit.

Barcode printing control device

An ink jet printer comprising a conveyor belt unitfor transferring a print sheeton a rotating conveyor belt, a resist roller pairand a BU rollerfor feeding the print sheetwhile flexing it in the transferring direction, and first and second ink jet headfor ejecting ink toward the print sheet, wherein the ink jet headejects ink darker in color than ink ejected from the ink jet head. The ink jet headserves to eject ink, that is darker in color than that of the ink jet head, and is located at a position farther than the arriving position of the print sheetwhen the print sheetis displaced from the conveyor beltin the transferring direction as the elasticity of the print sheetdue to flexure exceeds adhesion between the print sheetand the conveyor belt, while the ink jet headis arranged between the ink jet headand the BU roller. By this configuration, print quality can be sustained with high speed printing by using an ink jet head and reduction in printer size achieved.

Ink jet printer and printing method

A controller reads out image data of an area frame that a user has drawn on an original and accurately extracts the area frame by removing noise from the read-out image data to divide image data of an area outside the area frame and image data of an area inside the area frame into separate stencils, according to a separation program. It is therefore possible to execute a separation process desired by the user without increasing costs and man-hours and with easy operations not making the user feel troublesome.

Stencil printing machine with a plurality of drum units and method of controlling the same

Color image information is converted to black-and-white image information. Based on the converted black-and-white image information, a black-and-white printout is obtained. At least either brightness or saturation is independently controlled for each desired hue, based on a color image signal carrying the color image information. The controlled color image signal is converted to a black-and-white image signal carrying the black-and-white image information, and the black-and-white printout is obtained based on the converted black-and-white image signal.

Method and apparatus for printing a black-and-white image based on color image information

A user PC for controlling a stencil printing machine having a plurality of exchangeable printing drums, wherein respective printing drums are mounted with respective perforated stencil sheets which are formed by a stencil-making processing section on the basis of image data, and a print sheet is held in press contact with the plural printing drums to perform a stencil printing process with first and second stencil-printing processing sections is disclosed as having a registering function to register printing ink colors to be used for printing with the respective printing drums by enabling reading-in of a printer driver and to store useable ink color information, a function to produce display data to display contents of the ink-color designating information produced by the designating section for the respective printing drums.

Printing control device for printing machine having plural printing drums

Dot-gain information representative of the dot gain of ink is input for each ink type to be used in printing by a dot-gain information input section ( ), and spectral-density information representative of the spectral density of the ink is input by a spectral-density information input section ( ). Based on the input dot-gain information and spectral-density information, a perforation-size control section ( ) outputs a heating signal (ENS) and a voltage control signal (S) so that the size of a perforation becomes a predetermined printing dot size at all times.

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Ibaraki-ken, Japan

Mitsuaki Ishitoya