Fuji Photo Film Company, Limited

Fujifilm Corporation

Seiichiro Morikawa

Hiroshi Sato

Fumito Takemoto

Hiroshi Tashiro

Hitoshi Urabe

Yusuke Namba

Masato Shirakawa

Mamoru Kuramoto

Yosuke Matsumoto

Hiroshi Shirakura

The present invention is to provide a flexographic printing plate having excellent ink uniformity in an image area, particularly, in a solid portion regardless of a printing speed, a method for manufacturing the flexographic printing plate, and a flexographic printing plate precursor used in the manufacturing of the flexographic printing plate. The flexographic printing plate of the present invention is a flexographic printing plate having a relief layer provided with a non-image area, and an image area having an uneven structure formed on the surface, in which a concave portion constituting the uneven structure is formed of at least one of a plurality of grooves having a fixed width extending in one direction or a plurality of hole groups constituted of a plurality of bottomed holes having the same diameter scattered in the one direction, a depth of the concave portion is 2 to 20 &#x3bc;m, each of the plurality of grooves and the plurality of hole groups is arranged in an orthogonal direction orthogonal to the one direction, and the grooves and the bottomed holes respectively have two or more kinds of widths and diameters.

Flexographic printing plate, method for manufacturing flexographic printing plate, and flexographic printing plate precursor

The present invention is to provide a flexographic printing plate having high ink transferability and making it possible to perform printing with a high ink density in a solid portion, a flexographic printing plate precursor, a method for manufacturing a flexographic printing plate, and a method for manufacturing a flexographic printing plate precursor. A flexographic printing plate includes a relief layer including a non-image area and an image area having an uneven structure formed on a surface thereof, in which an average length RSm of roughness curve elements of the surface of the image area having the uneven structure is 15 to 120 &#x3bc;m, an oil-retention volume A2 is 2 to 180, and a load length ratio Rmr 30% at a cutting level of 30% is 20% to 90%.

Flexographic printing plate, flexographic printing plate precursor, and manufacturing methods therefor

An object of the present invention is to provide a flexographic printing plate having excellent ink transferability in a solid portion and the like and having good printing quality in a halftone portion. The flexographic printing plate of the present invention is a flexographic printing plate having a relief layer including a non-image area and an image area, in which the image area has a halftone dot portion having a halftone dot area ratio of more than 0% and less than 100%, and a solid portion having a halftone dot area ratio of 100%, small dots in the halftone dot portion and the solid portion or small dots in the halftone dot portion have two or more recessed portions having different depths according to a halftone dot area ratio, and the two or more recessed portions having different depths are recessed portions whose depth becomes deeper as the halftone dot area ratio increases.

Flexographic printing plate

The present invention is to provide a flexographic printing plate having high ink transferability and making it possible to perform printing with a high ink density in a solid portion, a flexographic printing plate precursor, a method for manufacturing a flexographic printing plate, and a method for manufacturing a flexographic printing plate precursor. A flexographic printing plate of the present invention includes a relief layer including a non-image area and an image area having an uneven structure formed on a surface, in which the uneven structure is composed of recessed portions consisting of a plurality of grooves and projecting portions other than recessed portions, each of the plurality of grooves has a length of at least 30 &#x3bc;m, all of the plurality of grooves are grooves having a line edge roughness in a range of 0.5 to 2.5 &#x3bc;m in a region of 30 &#x3bc;m of the groove in a longitudinal direction, a depth of the recessed portion is 5 to 25 &#x3bc;m, and a ratio of the projecting portion is 5% to 60% of a geometric area of the uneven structure.

Flexographic printing plate, original plate of flexographic printing plate, and manufacturing method therefor

An attentional portion to be corrected in gradation of an image is specified, and a gradation corrective function with respect to a density of the specified attentional portion is generated. Preset gradation conversion characteristics are corrected with the gradation corrective function, and the gradation of the image is converted according to the corrected gradation conversion characteristics. The gradation conversion characteristics can be corrected in the vicinity of a desired density.

Method of processing image

A smoothing circuit smoothes lookup tables generated by a color conversion table generator, using a filter function selected from a filter function storage circuit, and supplies smoothed lookup tables to a color processing circuit. Density data supplied from a calibration circuit are converted into halftone dot % data according to the smoothed lookup tables. The halftone dot % data are interpolated and then converted into LD control data, which are supplied to laser diodes.

Method of and apparatus for processing image data

Hue, lightness, and saturation signals are obtained from an input signal, and hue direction intensity signals with respect to respective unit colors are determined using color corrective intensity functions for respective hues which have been established based on measured values. These hue direction intensity signals are multiplied into corrected intensity signals with respect to the respective colors, which are multiplied by desired correction coefficients. Resulting product signals for the respective unit colors are added into corrected signals with respect to given color signals.

Method of and apparatus for correcting color

An apparatus for processing a digitized image signal includes a random-number generator for generating random-number data, an adder for adding input digital image data and random-number data outputted from the random-number generator, into sum data, and an image processor for processing the sum data from the adder.

Method of and apparatus for processing digital image data

A readout region with a plurality of zones at grid points is scanned by a transparency or reflection reader to obtain any image data therefrom. Then, a variance of each of three primary colors of the image data is calculated, and compared with a predetermined threshold value to determine whether an original is present in the readout region. When at least one of the variances of the three primaries is greater than the threshold value, then it is determined that an original is present in the readout region.

Method of and apparatus for determining whether an original is present

To produce a correction table to be referred to when a quantum level data (QL data) as an input image data to a given image output device is converted into an image having a halftone dot percentage, reference QL data having a plurality of data values arranged at predetermined data intervals are inputted to the image output device; the halftone dot percentage of an output image from the image output device are measured; an approximation formula of a desired function form is determined to approximate the measured halftone dot percentage by the method of least squares, on the condition that the formula should go through preset starting and ending points; and the correction table is produced based on the resulted approximation formula.

Method of and apparatus for generating correction table for image

A basic gradation curve, a gray balance, and a black curve are selected, and a tone reproduction curve is generated based on a combination of the basic gradation curve, the gray balance, and the black curve which have been selected. Using the generated tone reproduction curve, a sample image is color-separated to generate a proof. The proof is checked, and, if necessary, the tone reproduction curve is corrected until an optimum tone reproduction curve is generated.

Method of and apparatus for generating tone reproduction curve for

An apparatus for processing an image data digitally comprises a storage device for storing therein a multiplier varying in accordance with a first image data obtained by digitally processing the image data, the length of the integral part of the first image data being n bits, a random number generating circuit for generating a random number falling on somewhere between zero and a positive number less than unity, an arithmetic circuit for performing arithmetic operations including a multiplication of the random number by the multiplier, and an adding circuit for adding the output of the arithmetic circuit to the first image data and outputting the least significant m bits (m.ltoreq.n) of the integral part of the so-added data as second image data for use in the next process.

Method and apparatus for digitally processing an image based on a random

This invention is a method for forming halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated electrically, which comprises the steps of exposing and scanning a light spot of a predetermined size at a predetermined pitch to form halftone dots, and changing the number of said pitch so as to obtain an arbitrary screen line number. Further, this invention relates to a light beam scanning apparatus for forming halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated electrically, which comprises a first laser diode for emitting a synchronizing laser beam, a second laser diode for emitting a recording laser beam, a galvanometer for inputting the synchronizing laser beam and the recording laser beam through a collimator and a mirror, a synchronizing signal generator and an image recording section for inputting laser beams reflected and deflected by said galvanometer, a PLL multiplier for outputting a synchronizing signal by inputting an electric signal from said synchronizing signal generator, and an output controlling section for driving the second laser diode in accordance with the image signal and the synchronizing signal.

Method for forming halftone screen and apparatus therefor

Disclosed herein is an image processing apparatus for determining the rate of UCR (under color removal) for each color by a function of each of color signals. The image processing apparatus basically comprises a device for determining the maximum value Max and the minimum value Min of each of input signals Yi, Mi and Ci, and a device for determining the rates of UCR indicative of Y.sub.U, M.sub.U and C.sub.U from the input signals Yi, Mi, Ci and the maximum value Max and the minimum value Min, using respective functions F.sub.Y, F.sub.M and F.sub.C. The above-described Y.sub.U, M.sub.U and C.sub.U can be determined in accordance with the following equations:

Growing community of inventors

Hiratsuka, Japan

Seiichiro Morikawa