Abstract: A method of imposition proofing of printing data of a document onto a set of proof sheets is described, the document having one or more sections, each proof sheet having a recto side and a verso side, the printing data including imposing information and printing information for positioning and printing a set of pages onto one or more print sheets, each print sheet having two print sheet sides, a verso print sheet side and a recto print sheet side, each print sheet side having at least four pages. The method includes, for each print sheet in the printing data, dividing the pages imposed on each side of the print sheet into printer spreads of two pages, and determining information referencing the printing data, for defining how each printer spread is printed on each side of a proof sheet.

Abstract: Scan exposure in a row or swath scanner is controlled by pulsing light sources with pulses that are separated by dark intervals from each other--and from the detector readout periods. Detector sequencing is thereby made independent of the velocity of the pixel-line advance mechanism. Different pulse widths for different colors provide color correction without calculation, or regularize color-space conversion calculations where needed. In a swath scanner, known technology of printing modes is imported into the scanning context. Order of pixel columns within each swath is reversed for printing--permitting use of novel configurations such as a dual-parallel-flatbed copier in which a single common scan-and-advance mechanism simultaneously transports the scan sensor and printheads. To produce mirror images, this configuration is also used without column reversal. In addition to red, green and blue light sources, an infrared source is used for reading invisible indicia that identify forms or media types.

Abstract: It is an object to provide an image processing apparatus which can obtain an image reproduction that accurately corresponds to an original color when an ordinary color original is read and which can obtain an accurate marker edition result when a marker original is read. When a color scanning mode to read the color image is selected, an original ground removal by a prescan is not performed. When a marker edition scanning mode to read the marker original is selected, the original ground removal is executed. Thus, a color reproduction which accurately corresponds to the original is executed in the color scanning mode. In the marker edition scanning mode, the color recognition of the marker color is accurately performed without being influenced by the ground color.

Abstract: A standard conversion table setting unit establishes a standard conversion table for converting YMCK halftone dot percentage data supplied from an image editor into color image data in a common color space for generating a predicted image under standard output conditions to produce a final image. A differential parameter setting unit establishes differences between the standard output conditions and actual output conditions as differential parameters. A differential conversion table setting unit establishes differences between the standard conversion table and a conversion table for producing a predicted image corresponding to the final image generated under the actual output conditions, as a differential conversion table based on the differential parameters. The conversion table corresponding to the actual output conditions is generated using the standard conversion table and the differential conversion table, and image data to produce the predicted image are generated with the conversion table.

Abstract: A method of forming a camouflage pattern, a method of manufacturing a camouflage material in accordance with the pattern, and a camouflage material so manufactured. The method is performed by the taking of a series of photographs in a setting in the environment in which the camouflage configuration is intended to be used. One typical environment might include oak, poplar and birch trees. The individual images of the photographs are then entered graphically into a computer. The computer images are then overlain, one upon another, to form a composite print. Using the computer, the colors in the composite print are separated into a plurality of color prints portraying the predominant colors in the composite print. The colors are identified, and a corresponding plurality of layer screens based upon the individual color prints are made. The layer screens are then employed to screen the identified colors onto a sheet of material.

Abstract: A system and method for employing a digital representation of a color image to be printed in a printing system is provided. The method includes generating at least one raster representation of the color image to be printed and a run length representation of the color image wherein the high resolution representation includes a plurality of files, each file storing information representing a single color to be printed; and a run length file including at least the run length information of the color to be printed. Preferably, each one of the plurality of files including at least an indication for each pixel whether to print the raster representation or the run length representation. The method also includes providing the raster representation and the run length representation to printing apparatus.

Abstract: A system for reducing toner or ink consumption in rendering images, in which a transfer function is used to modify screening of the image to be rendered. Rendering systems including the use of single or multiple colors can employ the present invention. An algorithm is used in the present system to read in an arbitrary halftone dot and for each pixel in the halftone cell the output is a replicate of the threshold, Ta or Tb, surrounded by three pixels of white thresholds, a smooth transition from white to the now reduced maximum area coverage (such as 25%), while creating or maintaining the appearance of image uniformity at this reduced maximum area coverage.

Abstract: An image processing apparatus which provides image data to an image forming apparatus capable of forming an image by overlaying recording material of at least two colors separates color image data into at least two color component image data, and performs a first correction in consideration of a light-shielding effect and a second correction so as to maintain a density ratio of each color component image data. Then, in accordance with a density value of a second color component image data applied with the first correction, either a first corrected result or a second corrected result is selected. Thereby, decrease of a density value caused by the light-shielding effect is corrected, further correction for maintaining color balance can be performed.

Abstract: An object of this invention is to improve the operability of color adjustment by using a simple hardware arrangement which performs only a matrix arithmetic operation having matrix coefficients properly determined in accordance with adjustment amounts designated from an operation unit for adjusting three variables as lightness, saturation, and hue. In the constitution of this invention, an image input unit inputs a color input signal, and a color conversion unit extracts the minimum value from the input color signal for each pixel, obtaining a difference signal of the input color signal and the extracted minimum value signal. The obtained difference signal is converted in matrix in accordance with matrix conversion coefficients generated by a matrix conversion coefficient unit in correspondence with the adjustment amounts of the adjustment items of an operation unit for adjusting three variables as lightness, hue, and saturation.

Abstract: The present invention readily produces an image of a special color separation, with respect to a color image which is to be reproduced by a plurality of color separations including Y, M, and C separations. The method first specifies a relationship between a predetermined density of a special color separation and densities of a plurality of other color separations corresponding to the predetermined density of the special color separation; then extracts each color element included in a color image as a target color element; and determines a density of the special color separation according to the specified relationship.

Abstract: A color printer which performs a printing operation according to data from an upper unit such as a host computer. Switching mechanisms each which switches the state of each color printing unit to either a return state or an evacuation state are respectively arranged to the color printing units. A control unit judges as an unused color a color satisfying a predetermined unused condition among the plural colors and controls the corresponding at least one of switching mechanisms to switch the state of the color printing units corresponding to the unused color to the evacuation state. Since the evacuation operation of the color printing unit is performed without deteriorating the printing performance, the reduced power consumption, prolonged serviceable life of a color printing unit with a low use frequency, and improved print quality can be realized.

Abstract: A gamut compression method and apparatus for a color DTP system in which more natural-looking color regeneration is achieved in consideration of the difference in gamut from one device to another. If the gamut of the output system GMout is smaller than that of the input system GMin, the gamut of the input system is divided into four portions in a two-dimensional plane of lightness and chroma, under a constant color hue, using two straight line segments, and gamut compression is done by varying the compressing direction for each area, so that the color in the gamut of the input system will be converted into the color in the gamut of the output system.

Abstract: A system for trapping of a dark image object on a lighter colored background is disclosed. In a system using a page description language including overprint operators, black image areas (such as text, lines, graphic objects and the like) can be set to overprint colored background areas in a manner that eliminates rendered image defects including page-colored "halo" effect that can occur when the cutout background area underlying the black object is misregistered with the black object that was intended to cover the cutout area. In other systems, the present invention may be employed as a disabling of the undercolor removal system of a colored area that would otherwise be present under the black object. Systems using black plus at least one other toners or ink color (such as cyan, magenta and/or yellow or many other colors) can usefully employ the system of the present invention.

Abstract: During a black-and-white image reading mode, for each picture element, outputs from at least two of the light receiving elements of the R, G, and B light receiving elements are added together into color sum data. Whether the picture element presents black or white is determined based on the sum data.

Abstract: An imaging system for applying separate color tonemaps comprises an optical scanning assembly configured to scan an object and produce image data having a first resolution that corresponds to a color characteristic. A memory device associated with the imaging system stores a look-up table that corresponds to a predetermined transfer function. An image data processor operatively associated with the memory device and the optical scanning assembly alters the resolution of the image data having the first resolution to produce image data having a second resolution, the second resolution being less than the first resolution, and also applies the image data having the second resolution to the look-up table to look up LowPoint image data having a third resolution, the third resolution being greater than the second resolution.

Abstract: There is provided an image processing apparatus capable of providing preview display reflecting the result of editing operation and more faithful to the final image even in case an editing operation is conducted. The apparatus is provided with an input device for entering image data corresponding to an original image, an editing process unit for effecting an editing process on the image data entered by the input device, an image output device for forming an image based on the image data released from the editing process unit, a first preview image data output unit for releasing preview image data based on the image data entered by the input device, and second preview image data output unit for releasing preview image data based on the image data subjected to the editing process in the editing process unit.

Abstract: A computer (500) with a graphics program, an eight-plane raster image processor program, an eight-plane print-sending program, and a contrast-control program is connected to a single-bit, four-pass, electrographic printer (430). One or more of the primary colors is individually divided into multiple layers (100', 200 . . . ), with each layer having an independently selectable contrast setting (300--330). The printer (430') is now capable of printing images with an improved color gamut and dynamic range.

Abstract: A system for converting original RGB color signals to CMY signals includes the step of separating color signals from the original image into low-frequency and high-frequency components. The low-frequency components are converted to CMY signals via a look-up table reflective of a non-linear algorithm, while the high-frequency components are converted to CMY signals according to linear algorithms. The technique avoids color distortion caused by high-frequency noise, such as from halftone screens, in the original image.

Abstract: A polarizing plate, two phase plates having predetermined phase differences, two birefringence plates are disposed on a common optical axis, thereby effecting color separation of three color light components of R, G, and B as well as positional separation of their optical paths in a simple configuration without using color filters. A first phase plate (7) and a first birefringence plate (8) are used to separate, in terms of color and position, linearly polarized light carrying color image information into a cyan color component (CL) and a yellow color component (YL). Then, a second phase plate (9) and a second birefringence plate (10) are used to separate, in terms of color and position, the cyan color component (CL) and yellow color component (YL) into a blue color component (BL), a green color component (GL), and a red color component (RL), so as make them incident on their corresponding line sensors (11A, 11B, 11C) on a light receiving means (11).

Abstract: A simple color separation apparatus includes a light source for radiating light on the document, a movable color filter set arrayed in parallel with the main-scanning direction, the movable color filter set includes filters selectively transmitting colors respectively, which separate into three colors the radiated light reflected from the document, wherein each filter has sufficient length to cover the light in the main-scanning direction and a width that prevents interference between colors of the reflected and separated light; a lens for image-forming the light transmitted by each filter of the color filter set; a three-line CCD sensor for converting the light image formed by the image-forming lens to electrical signals, wherein the three-line CCD sensor includes three lines arrayed in parallel with the main-scanning direction, each of which has a line width that is determined by the magnification of the lens; and a carriage for moving the color filter set in the sub-scanning direction.

Abstract: A method and system for determining an equal amount of a plurality of color densities to be removed in rendering a multicolor image using a black toner and the plurality of colored toners. The rendering of the multicolor image is executed with a multicolored digital inputs according to undercolor removal techniques. The includes providing a black toner coverage bit count and a total colored toner coverage bit from a plurality of colored toners (often cyan, magenta and yellow) to be used in rendering the multicolored image. The black toner and colored toner coverage estimations are summed; if this sum exceeds a predetermined maximum total toner density level, an equal amount R of toner to be removed from each colored toner separation is determined by subtracting the predetermined maximum from the sum of the black and colored toner estimations, and then dividing the result by the number of colored toner used to produce gray (again, usually 3-cyan, magenta and yellow).

Abstract: An original image signal, which represents an original image and is made up of a series of original image signal components Yij, is obtained. Corresponding interpolation coefficients Bij and Cij, which are set for each of the original image signal components Yij, in two different interpolating functions f and g, represented by Formulas (1) and (2), for obtaining two interpolation images having different levels of sharpness are linearly combined with each other by using Formula (3). A new interpolation coefficient Aij is thereby obtained. An interpolating operation is carried out on the original image signal components Yij with an interpolating function h, which has the new interpolation coefficient Aij and is represented by Formula (4). An interpolation image signal is thereby obtained, which is made up of a series of image signal components occurring at intervals different from those of the original image signal components Yij,f=.SIGMA.Bij.multidot.Yij (1)g=.SIGMA.Cij.multidot.Yij (2)Aij=(1-.alpha.)Bij+.

Abstract: A stencil composition processing apparatus for color printing comprises a contouring means which scans data of an original picture made up of multiple figures of different colors and detects the profile and color of each figure, a contact/proximity detection means which detects for each figure as to whether there exists any other figure of different color in contact with or close to a prescribed surrounding area of the figure, and a grouping control means which groups the figures into multiple groups each including figures that have different colors and are not in contact with nor close to each other based on data provided by the contact/proximity detection means and combines the figure groups so as to cover figures of all colors that make up the original picture.

Abstract: In a three-dimensional LUT for color conversion, the values of converted color component data C', M', and Y' are varied for a specific combination of the values of color component data C, M, and Y representing white, and the values of converted data are then changed for other combinations accompanied by the variation with respect to the specific combination. Referring to FIG. 1B, a concrete procedure first calculates variations of the values of color component data C', M', and Y' at step S20, and then selects combinations of the values of color component data C, M, and Y for which the values of color component data C', M', and Y' are not changed, among a plurality of combinations of the values of color component data C, M, and Y at step S22. For colors between white and cyan, magenta, yellow or black, the variations of the values of color component data C', M', and Y' are set to decrease in an increase in distance from a point corresponding to white in a three-dimensional color space at step S24.

Abstract: A colorant selection method and apparatus for a color reproduction device. The colorant selection method and apparatus is capable of finding all the sets of colorants that yield a specific color. Once all the sets of colorants have been found, one of the sets of colorants is selected and used by the color reproduction device to render the specific color.

Abstract: A method and an apparatus for obtaining a gamut description of a multidimensional color reproduction device. The method is based on the transformation of several types of colorants boundaries that map to the boundaries of the color gamut of the device in color space.

Abstract: A computer product for controlling a color-reproduction process employing N colorants, where N is greater than 3, the computer program product comprises: a computer readable storage medium having a computer program stored thereon for performing the steps of: defining a first transformation from a N-dimensional colorant-signal space associated with the color-reproduction process to a 3-dimensional colorimetric space such that each combination of N colorant signals is mapped to a visual color that would be produced by the process in response to that combination of signals; defining a second transformation for mapping from a 3-dimensional parameter space into the N-dimensional colorant-signal space for defining a particular 3-dimensional subspace of the N dimensional colorant-signal space for ultimately restricting the permitted combinations of the N colorant signals; combining the first and second transformations for defining a third transformation for transforming data directly from the 3-dimensional parameter

Abstract: The present invention provides an apparatus and method for producing series of high resolution color composite images. The digital camera has an optical assembly that directs visual images to a high resolution monochrome sensor and a lower resolution color sensor. These two sensors, which produce a succession of frames at the same rate, are encrypted with a frame number and time code and are stored in a frame buffer. The contents of the frame buffer can be transferred to a mass storage device, or a color rendering processor that produces a composite image from the monochrome frames and color frames. During the processing of the composite image, the monochrome grayscale value becomes the composite frame grayscale value, the color frame hue value becomes the composite frame hue value, and the color frame saturation value becomes the composite frame saturation value.

Abstract: A color image reading apparatus includes a light-receiving unit in which a plurality of line sensors are disposed at equal intervals on a same substrate, an imaging optical system for imaging an object on the light-receiving unit, a blazed diffraction grating, disposed in an optical path between the imaging optical system and the light-receiving unit, for color-separating light from the object into a plurality of color light beams, and a dichroic mirror disposed in an optical path between the blazed diffraction grating and the light-receiving unit, and having at least two reflecting surfaces.

Abstract: A method and apparatus are provided for producing a rastered gray composite proof in which the color values of the chromatic printing inks "cyan", "magenta" and "yellow" are united to brightness-equivalent gray scale values for simple advance monitoring of a color printing. The gray scale values to be printed on the gray composite proof are corrected compared to the gray scale values of the chromatic printing inks for the color printing represented by the color separation values, being corrected to different percentage parts that respectively correspond to the subjectively sensed brightness impression of the chromatic printing inks relative to "black". The color separation values of the chromatic printing inks are converted into individual bit maps by different raster functions such that the recorded pixels of the chromatic printing inks lie next to one another on the recording material. The individual bit maps of the chromatic printing inks are united to form an overall bit map by an OR operation.

Abstract: A method and apparatus for performing a rough crop of a mounted image off-line prior to scanning. The apparatus comprises a kit having cards with apertures of various defined sizes and slide holders corresponding to standard original (film) sizes to be used. Each aperture card is labeled for identification, and each slide holder is marked with labeled lines at discrete intervals parallel to the card edges, following a Cartesian orientation. An original to be scanned is mounted in a slide holder corresponding to its size, and an aperture card selected for the desired cropping aperture, from the set included in the kit, and placed on top of the slide holder card with the outside edges of both cards aligned. An offset of the crop aperture from the center of the image is accomplished by shifting the crop card until one or more of the parallel lines on the slide holder come into view.

Abstract: A method and an apparatus for the conversion of color values of a first color space into color separation values of a printing color space characteristic of a printing process in apparatus and systems for color image processing. For the purpose of exact adaptation of the color separation values ?C, M, Y, K! of the printing color space to the respective printing process, the functionally allocated color separation values ?C, M, Y, K! are first approximately analytically calculated from the color values ?L*, a*, b*! of the first color space as a printing table ?C, M, Y, K=f(L*, a*, b*)!, taking the printing colors of the respective printing color space of the later printing process, the colorimetric properties of the printing material employed later, and the printing process parameters into consideration.

Abstract: The color image input apparatus according to the present invention comprises a document illuminating means for illuminating a document; a color separating means for subjecting reflected light from the document illuminated by said document illuminating means to color separation; a document reading means for receiving the reflected light subjected to color separation by said color separating means, subjecting the reflected light to photoelectric conversion and reading the light as an image signal; a color material determining means for determining a type of a color material used for the document according to the image signal read by said image reading means; and a color correction processing means for subjecting the image signal read by said image reading means to a color correction processing according to a result of determination of said color material determining means.

Abstract: An image processing apparatus for performing accurate discrimination between specific originals and ordinary originals. CCD 101 inputs RGB signals, and color-space matching judgment circuit 106 and pattern matching judgment circuit 113 judge the similarity in the color distribution and pattern between the input RGB data and a predetermined specific image data. CPU 114 judges the similarity and print-signal generator 105 generates a change signal in accordance with the judged similarity. The input RGB signals are changed based on the generated change signal and outputted to external color printer 111.

Abstract: Input data corresponding to three primary colors C, M and Y are subjected to masking correction, to obtain data C', M' and Y'. A correction factor in a masking equation is varied depending on which of three sections into which all the gray levels of each of the input data C, M and Y are divided, the section being a section to which the input data of a selected color belong. As a result, suitable masking correction conforming to the value of the input data is made, thereby to improve color reproducibility of a color image.

Abstract: A method and system for embedding a device profile into a document and extracting a device profile from a document in a color management system. A tagged-element device profile allows for selective access to the device profile. The method of embedding a device profile into a document include allocating memory for a buffer, sending a ready call, transferring the device profile or portions of the device profile into the buffer and writing the same in the document, and lastly, sending a completed call. The method of extracting a device profile from a document includes allocating memory for a buffer, sending a ready call, reading the device profile or portions of the device profile from the document into the buffer and transferring the same to a file, and finally, sending a completed call.

Abstract: An apparatus for correcting contrast of a selected range without changing lightness and color tone of a pixel designated as a central object of processing.

Abstract: This invention relates to a method and apparatus for processing an image and particularly a method and apparatus for providing a function of automatically judging whether an input image is a color or monochrome image. This invention discloses various arrangements for preventing errors in the above judgement.

Abstract: An image processing apparatus includes an input device for inputting first color component signals for plural colors in parallel from outside through parallel lines, a convertor for converting the input first color component signals for plural colors to second color component signals for plural colors, an output device for serially outputting the second color component signals for plural colors converted by the converter to the outside through one of the parallel lines, and a controller for controlling the output device and the input device in order not to operate simultaneously.

Abstract: A color image reading apparatus improves the reproducibility of colors at the black level end of the brightness scale of each of component color images of an original medium. The color image reading apparatus includes an illuminating unit that illuminates the original medium such as a film original, an imaging device that forms images of the original medium based on three component colors of red, green and blue and outputs a red color signal, a green color signal and a blue color signal, a gain controlled amplifying device that amplifies each of the component color signals output from the imaging device and a gain setting device that sets a common, adjustable gain for each of the component color signals using the single amplifying device.

Abstract: A printer system amd method for printing a clear image. When black characters or characters printed in a black reverse are expanded, the contours thereof are printed in black only and the inside or the outside of the contours which are designated to be printed in black color are printed in the three colors such as magenta, cyan and yellow in half tone or in an pseudo-half tone as well as in black. Image data is expanded on a image memory 1 according to instructions from a computer 1. A black-color determining unit determines whether or not the expanded image data includes a black pixel and an edge extracting unit 105 extracts an edge pixel in the expanded image data. A selector selects a black color only for a black edge portion and selects other colors in a half tone or in a pseudo-half tone as well as in black for a black but non-edge portion. It outputs the image according to such selections to a color printer.

Abstract: Each image area in a total image is assigned with a screen angle mode Ms indicating whether screen angles of magenta and cyan separations are to be adjusted or not. Screen angle data representing screen angles of magenta and cyan are produced according to the screen angle modes Ms. A dot signal for recording a halftone image of each of the magenta and the cyan separations is generated by comparing screen pattern data of a certain screen angle specified by the screen angle data with image data for each color separation. Accordingly, the present invention effectively prevents a moire in any image area included in a printing image.

Abstract: A monochromatic scanning system includes an illumination system, a document staging system, an optical lens system, a photosensing system to convert light to electrical signals and a color drop-out filter. The illumination system illuminates an original image to be scanned in the document staging system and the optical lens system directs light reflected from the original image to be scanned onto the photosensing system. The color drop-out filter is located in an optical path between the original image to be scanned and the photosensing system such that the color drop-out filter allows a predetermined range of wavelengths to pass therethrough and a range of wavelengths associated with infrared radiation to pass therethrough. this enables the monochromatic scanning system to have drop-out capability by merely substituting the color drop-out filter without further modifications to the scanning system.

Abstract: An image processing apparatus (1) comprises a color image scanner (2) for producing digital data defining pixels representing an image in terms of cyan (C), magenta (M), yellow (Y) and black (K) components. The CMYK data from the scanner is received by a conversion processor (5) and a color converter (6). The color converter (6) together with a format converter (7) converts the CMYK data into RGB data, representing the image in terms of its red, green and blue components, for processing by a drawing processor (9). The operation of the scanner (2) is adjustable to a desired setting to provide CMYK data to which a color correction has been applied. In order that the RGB data accurately represents the color content of the image the effect of the color correction must be removed.

Abstract: Color scanner apparatus utilizing color separation with multiple point narrow band illumination from N-colors of LEDs may comprise a multicolor light source for successively illuminating an object with N different colors of light between about a color red and a color blue. A photosensor responsive to light reflected from the object converts the reflected light into sets of color image data signals corresponding to each of the N different colors. A color image data processing apparatus connected to the photosensor converts the sets of color image data signals corresponding to each of the N different colors into equivalent tristimulus values.

Abstract: A color correction device for applying a correction to an image read from an original image so as to correct color deviations caused by spectral characteristics of a color image reader, including:a data conversion device for converting the image of the color components into image data of color components based on three attributes,a color deviation detection device for detecting a color deviation of a reference color by comparing with a predetermined hue data of the reference color,a storage device for storing correction coefficients set in advance for the respective colors,a correction data setting device for setting correction data used to correct the color deviations of the respective colors, anda data correction device for correcting the hue data of the respective colors by the correction data setting device.

Abstract: With the present invention, an inputted color image is separated to image signals for three colors of Red, Green and Blue, determination is made as to whether a remarked pixel is for a specified color or not according to the image signals for the separated three colors, brightness data for the inputted color image is detected, determination is made as to whether a remarked pixel is for a white color or a black color depending on the detected brightness data, a pixel determined as for a specified color is converted to a specified color, and a pixel determined as not for a specified color is converted to a white color or a black color according to a result of determination as to whether the remarked pixel is for a white color or a black color, so that a separation area for a specified color can clearly be defined.

Abstract: An image reading apparatus comprises a photoelectric converter including three linear image sensors of red, green and blue aligned in parallel to each other along a main scan direction. When a document is scanned, a document is read by the photoelectric converter by moving it relative to the document. The moving direction is set to be a first direction, for a prescan and a second direction reverse to the first direction, for a normal scan. Analog output signals of the first to third linear image sensor are converted to digital signals. In a prescan, a selector exchanges the digital signals of the first and third linear image sensors, while in a normal scan, the selector does not exchange them.

Abstract: A method and apparatus for blending pictorial and graphical look-up tables is provided. The blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal.

Abstract: When an original image of a full color is reconstructed by two colors, it is intended to prevent that a part of the original image is not reconstructed. An image of a full color original is read by a CCD, thereby forming signals of R, G and B. In an image processing unit, the R, G, and B signals are converted into red and black signals. The red and black signals are sent to a printer unit and an image is formed in red and black.