Abstract: In image processing according to the prior art, the important part of photographic image data (referred to herein as the object) could not be determined and therefore required human participation. A computer 21 which is the core of image processing calculates an edginess which is an image variation from a differential value of data for adjacent picture elements in a step SA110, and determines object picture elements by selecting only images with a large variation in steps SA120, SA130. As optimum parameters for contrast correction and lightness compensation are calculated from image data for object picture elements in steps SA310-SA330, image processing indicators based on object picture elements are determined, and optimum image processing can be performed automatically.

Abstract: The invention discloses a Gamma transform unit. The Gamma transform unit has a lookup table. The lookup table stores a plurality of difference values corresponding to a plurality of predetermined input values. Each of the difference values substantially equals a difference between an ideal output value and a Gamma function output value, both of which correspond to one of the predetermined input values. After the Gamma transform unit has received an input value, it generates a required Gamma function output value corresponding to the received input value through referring to the lookup table.

Abstract: This invention relates to an MFP having copy and scanner functions. The MFP in which image data flows from a line sensor to a DRAM via an A/D conversion unit and a reading control unit (RCU) and then from an image processing unit (IPU) to a printer via the DRAM has the following arrangement. Both the RCU and the IPU can execute a shading process. In the CM, the RCU executes the shading process. Then, the image is compressed and stored in the DRAM. In the SM, the RCU does not execute the shading process, and the image is temporarily stored in the DRAM without compression. The IPU reads out image data of each rectangle from the DRAM together with shading data, executes the shading process and various kinds of image processing, and outputs the image data to the DRAM.

Abstract: According to one embodiment of the invention, an image document creation apparatus is provided so as to be connectable to a plurality of image forming apparatuses that have been arranged on a network, and has a configuration provided with an acquisition means that acquires color gamut information possessed by the image forming apparatuses; an identification means that identifies colors included in document data and/or image data saved in the image document creation apparatus; a color difference calculation means that calculates, for each of the image forming apparatuses, a color difference between the colors identified by the identification means and the color gamut information acquired by the acquisition means; an apparatus selection means that selects an image forming apparatus as a print target based on the calculated color difference; and a printing means that instructs the selected image forming apparatus to print the document data and/or the image data.

Abstract: A circuit and method for reducing artifacts in decoded color video and images are disclosed. The circuit includes a buffer for receiving an input pixel in a first color-space, and a detector for determining after transformation into a second color-space, if at least one component of the transformed pixel would fall outside a predetermined range. The determination may be made by comparing components of the input pixel, to corresponding ranges in the first color-space. Upon determining that at least one component of the transformed pixel would be outside a corresponding predetermined bound in the second color-space, the detector causes the circuit to output a pixel in the first color-space, with at least one predetermined component. The output of the circuit may subsequently be converted to the second color-space by an external color-space converter and displayed onto a color display. The method reduces visible artifacts caused by clipping during color-space conversion.

Abstract: The present invention introduces an intuitive system for digital processing. The system of the present invention allows a user to enhance digital images that appear dark or dull. In one embodiment, the user activates an image enhancement button on a graphical user interface using cursor control device such as a mouse button. In one embodiment, the digital image enhancement system is implemented using a nonlinear brightness level transformation correction and a pseudo gamma correction. The parameters for both the nonlinear brightness level transformation correction and a pseudo gamma correction are determined from examining the properties of the image to be enhanced.

Abstract: Embodiments of the present invention generally provide m Methods and apparatus for reducing power consumption of backlit displays are described. Power consumption is reduced by dimming backlighting by a first scale factor and boosting pixel values by a second scale factor to compensate for the dimming. The scale factors may be constant values. Alternately, one or both of the scale factors may be determined based on pixel values for one or more frames to be displayed and/or one or more frames that have been displayed. For example, scale factors may be calculated based on an average linear amplitude of one or more frames of pixel values or from a maximum pixel value of one or more frames of pixel values. A graphical processing system is described including an integrated circuit capable of transforming a pixel value from a gamma-compensated space to a linear space.

Abstract: Sub-pixel rendering with gamma adjustment allows the luminance of the sub-pixel arrangement to match the non-linear gamma response of the human eye's luminance channel. For each of a subset of input sampled data indicating a region of an input image, a gamma-adjusted data value is generated for each input image data value in the subset using a local average of at least two input image data values. A sub-pixel rendering operation uses the subset of gamma-adjusted data values and the subset of input image data values to produce an output data value for each sub-pixel element on the display panel. A plurality of output data values collectively indicates an output image. The gamma adjustment allows the sub-pixel rendering to operate independently of the actual gamma of a display device. The sub-pixel rendering techniques with gamma adjustment may improve image contrast in high spatial frequency portions of an image.

Abstract: There is provided a method of changing a theme for a user interface of a computer system comprising receiving an identification of an image with which to define a color palette of a theme for rendering elements of a user interface on a color display of the computer system; analyzing the image to determine at least one predominant color; and defining the color palette in response to the analysis. The image may comprise a background image selected by a user for display by the computer system. Dynamic generation of the color palette matches the user interface to colors to provide flexible and appealing themes. A computer readable memory having recorded thereon instructions to carry out this method is also provided, as well as a device comprising such memory.

Abstract: A method and display device for correcting spatial non-uniformity in a display device are provided. The method includes receiving color signals of a pixel to receive the pixel, extracting correction data for correcting adjacent representative color signals which represent areas adjacent to the received pixel, and correcting the adjacent representative color signals using correction data and correcting the color signals of the pixel using the corrected adjacent representative color signals.

Abstract: Methods and systems in an image processing device for controlling colors that are located external to a gamut are disclosed. A plurality of color values can be automatically provided as input to said image processing device, wherein said image processing device is under a control of a particular dimensional order, typically a three-dimensional order, but alternatively can be a two-dimensional order. Next, an operation can be performed dynamically determining which color value among the plurality of color values has attained a gamut limit. Thereafter, the particular dimensional order can be automatically reduced, thereby providing improved control for colors that are located external to said gamut. The plurality of color values analyzed is generally associated with three colors—cyan, magenta, and yellow.

Abstract: A first lower-range generating portion generates a pixel value of an output image based on a first nonlinear function in a first lower range where a pixel value of a subject pixel is lower than a predetermine value. The first upper-range generating portion generates the pixel value of the output image based on a first monotonically increasing function in a first upper range where the pixel value of the subject pixel is greater than or equal to the predetermine value. The pixel value of the output image increases toward a first maximum output luminance value as the pixel value of the subject pixel increases. The first maximum output luminance value is greater than a luminance value obtained by correcting a maximum pixel value of the original image based on the first nonlinear function. The first maximum output luminance value is proximate to the maximum pixel value of the original image.

Abstract: A profile generator determines differences between the standard spectral reflectances of a color chart printed under standard density conditions and the spectral reflectances of a color chart printed while the density of one of the colors C, M, Y, K is changed, and the densities of the other colors are secured to standard densities. When density variations are established, the profile generator generates a print predicting profile using spectral reflectances produced by adding the standard spectral reflectances and the difference with respect to the color whose density has changed. The colors of a print produced when the density of a desired color is changed are predicted with high accuracy using the print predicting profile.

Abstract: Document processing systems and methods are presented for transforming color image data from an input color space to output color space using space filling interpolation to mitigate loss of color information at the corners of color gamuts. An initial interpolation of the input color space pixel values for each pixel is performed to compute initial output color space pixel values, and these are converted into luminance-chrominance color space pixel values. An adjustment value ? is then computed according to the luminance-chrominance color space pixel values, and final output color space pixel values are computed according to the initial output color space pixel values and the adjustment value ?.

Abstract: An image processing apparatus includes a first unit for converting primary color data into color data for outputting a dark color material only in a first mode, and a second unit for converting the primary color data into color data for outputting both the dark color material and a light color material in a second mode.

Abstract: An apparatus and method for converting color data are provided. The method includes generating a CMYK color gamut extended from a CMY color gamut that consists of a cyan (C) colorant, a magenta (M) colorant, and a yellow (Y) colorant, by use of the CMY color gamut and a black (K) colorant; mapping input colors using the generated CMYK color gamut; converting color data of the mapped input colors to CMY data; and converting the CMY data to CMYK data. Accordingly, natural representation and printing of low-lightness colors and high-saturation colors can be attained.

Abstract: An image forming apparatus including: an outputting section to output a chart which has a gradation pattern in a low-density area, the gradation pattern including patches, each of the patches having a density; a reading section to read-in the density of each of the patches; a calculating section to calculate, based on the density, an adjusting value to conduct a gamma correction; and an output adjusting section to conduct an adjustment of an output in the low-density area based on the calculated adjusting value.

Abstract: There is described an image display apparatus that includes an image data processing section to convert (n+m)-bit monochromatic image data to a n-bit color display image-data group, based on a predetermined correlation, and a color image display section to display a color image on it, based on the n-bit color display image-data group. The image data processing section includes: a candidate selection section to select “H” sets of signal-values out of all combinations of signal-values included in the n-bit color display image-data group as the candidate color display signal-value sets; a signal value decision section to determine a color display signal-value set, to be correlated with the (n+m)-bit monochromatic image data, from among the “H” sets of candidate color display signal-value sets; and a correlation establishing section to establish the correlation between the (n+m)-bit monochromatic image data and the n-bit color display image-data group.

Abstract: In a method of mapping data from a source space to a target space, a space transformation look-up table (LUT) that contains a plurality of locations storing information is maintained, wherein each of the plurality of locations includes information specifying a function to be evaluated. First data defined according to a multi-dimensional source space is input, and second data defined according to a multi-dimensional target space is generated, by applying information contained in the LUT to the first data.

Abstract: A color converter has a setting section, a determining section, and a converting section. The setting section sets the ratio between plural color rendering intents. The determining section determines a color conversion function for converting a first image signal in a first color space into a second image signal in a second color space different from the first color space, based on the ratio between the color rendering intents. The converting section converts the first image signal into the second image signal based on the color conversion function determined by the determining section.

Abstract: Disclosed are methods and devices for color compensation of a display having a translucent display cover applied to an outside surface of the display. A method may include characterizing a color shift due to the translucent display cover for when there is rendering of an image on the display and compensating for the color shift when rendering an image on the display. The method further may include measuring the color shift induced by the color of the finish, and as described below compensating the red, green, and blue (RGB) levels of the display so that the display image may be presented to the user as originally intended. In this way, the image quality may be substantially optimized for viewing regardless of the lens/cover surface color.

Abstract: A method of converting a color image into a monochromatic image, includes converting the color image into a color space representing brightness values and attribute values of pixels constituting the color image, converting the color image into the monochromatic image based on the brightness values of the pixels, and modifying brightness values of pixels of the monochromatic image based on eigenvalues corresponding to the attribute values of the pixels of the color image.

Abstract: An output color is calculated from a fundamental stimulus value and a spectral support coefficient which indicate an input color using a calculation unit for calculating an output color corresponding to the input fundamental stimulus value and the input spectral support coefficient using a table whose inputs are a fundamental stimulus value and a spectral support coefficient. The interval of grid points of the table are uneven regarding the spectral support coefficient, and the interval in the vicinity whose relevant spectral support coefficient is zero is small as compared with the interval in the vicinity whose spectral support coefficient has a great absolute value.

Abstract: A method and apparatus for processing a digital image to be displayed on a display panel illuminated with a backlight module. The backlight module is set to a specific backlight duty according to a luminance statistic of the digital image. The digital image is remapped through a tone mapping function formed according to the specific backlight duty and the luminance statistic.

Abstract: An apparatus and method for obtaining a planar image of a portion (4) of a body (5) and enhancing image quality of at least one specific organ or volume of interest located within the portion (4) of the body (5), administered with radiopharmaceutical substance radiating gamma rays, by using single photon emission imaging, for determination of functional information thereon, comprising: (a) acquiring at least one projection data of the portion (4), by means of a gamma camera detector (2); (b) determining the effective distance between the detector (2) and the specific organ of interest; (c) calculating weight values taking into account acceptance angles of the gamma camera detector (2) and the effective distance; and (d) obtaining a two dimensional image of a spatial distribution of the pharmaceutical substance within the portion (4) by mathematically analyzing the data in conjunction with weight values.

Abstract: A color characterization profile format and data structure are provided for allowing a color management solution to convert colors into or out of a color space. The color characterization profile format contains a color management measurement data portion and a container that is configured to provide digital rights management capabilities over the color characterization profile format. The container can include linked and embedded objects and extensible markup language. Further, the container can be an advanced systems format container. The container can be configured to perform different functions, including enabling private data extensions, operating interface description language, storing a rendering intent separate from the color management measurement data portion, the ability to be edited by a text editor application, operability across a plurality of operating platforms, and preventing a user from tampering with the color characterization profile format.

Abstract: The present invention provides a method of displaying an image on a display device having first and second sides, said image including an light restricting silhouette pattern having a plurality of first transparent or translucent areas, and at least one design layer having at least one color, said at least one design layer being visible from one side of said display device and substantially less visible from the other side, said image being substantially transparent or translucent as viewed from the other side, comprising the steps: 1) providing at least a definition of said design layer to a computer; 2) generating a computerized version of said design layer with the computer; 3) outputting the computerized version of said design layer to said display device, the computerized version of said design layer being modified to subdivide said design layer into a plurality of second discrete transparent or translucent areas and other areas, and 4) displaying said modified design layer and said silhouette pattern

Abstract: The present invention relates to a color adjustment apparatus and a method thereof. The color adjustment apparatus according to the present invention includes a calculation unit and an adjustment unit. The calculation unit receives an input color signal, and divides the input color signal into color groups and performs a calculation operation thereon to generate at least two calculation signals. The adjustment unit receives the calculation signals and the input color signal, and adjusts at least one of contrast group and complement group of the input color signal according to at least two of the calculation signals and a predetermined color value to generate an output color signal for a video-display apparatus. Accordingly, viewers can enjoy better visual experience.

Abstract: An apparatus for adjusting specific color attributes is provided. Wherein, the color space transforming unit receives a color input signal with R, G and B color attributes, and transforms it into a color middle signal with separated luminance (Y) and chrominance color attributes (Cb and Cr). The color controlling unit computes the hue of the color input signal to generate a hue signal and generates a hue signal, a saturation signal and an intensity fine-tune signal according to the hue signal, and computes the color input signal to generate an adjustment parameter and generates an adjusted saturation signal and an adjusted intensity fine-tune signal from the saturation signal and the intensity fine-tune signal according to the adjustment parameter. The color adjusting unit adjusts the color middle signal to output a color output signal according to the hue signal, the adjusted saturation signal and the adjusted intensity fine-tune signal.

Abstract: A color processing apparatus determines, based on output color gamut information, the color gamut conversion condition for converting the image data so that the color gamut of image data on the predetermined color space may fall within the output color gamut, converts the color gamut of input image data according to the set color gamut conversion condition, determines the limiting condition of the color gamut conversion, changes the color value of the specified color so that the color value of the specified color out of the input image data may be converted into the color corresponding to the output satisfying the limiting condition, and pre-processes so as to change the color value other than the color value of the specified color out of the input image data according to the relation between the color value before change of the specified color and the color value after change.

Abstract: Provided are an apparatus and method of gamma correction, and more particularly, an apparatus and method for varying a gamma curve according to a brightness level of a detected image signal to adaptively perform gamma correction, in a digital image processor. The gamma correction apparatus in the digital image processor includes a brightness level detector detecting a brightness level from an image signal generated by capturing an image, a gamma curve calculator moving a start point and/or an end point of an existing gamma curve for correcting an input brightness level to a predetermined output brightness level, according to the detected brightness level, and calculating a new gamma curve, and a gamma corrector correcting an input brightness level of the image signal using the new gamma curve, and outputting the corrected brightness level.

Abstract: The invention discloses a gamma image correction method and device that employs an improved interpolating operation, comprising receiving an original image data point; retrieving p conversion values (p is larger than 2) from a memory unit according to the original image data point; and arithmetically processing the p conversion values for generating a gamma corrected image parameter value from the original image data point wherein the original image data point is a N bits data, the memory unit contains 2k conversion values and N is lager than k.

Abstract: Sub-pixel rendering with gamma adjustment allows the luminance for the sub-pixel arrangement to match the non-linear gamma response of the human eye's luminance channel, while the chrominance can match the linear response of the human eye's chrominance channels. The gamma correction allows the sub-pixel rendering to operate independently of the actual gamma of a display device. The sub-pixel rendering techniques with gamma adjustment may be optimized for the gamma transfer curve of a display device in order to improve response time, dot inversion balance, and contrast.

Abstract: An apparatus for forming an image is disclosed which includes: an input device inputting image data; an image processor processing the inputted image data; an image forming device forming the image on a recording medium, based on the processed image data; a lightness setting device setting a lightness value of the image to be formed on the recording medium by the image forming device; a first corrector correcting the inputted image data according to a first correction characteristic; a first characteristic modifier modifying the first correction characteristic, in response to setting of increasing the lightness value by the lightness setting device; a second corrector correcting the processed image data according to a second correction characteristic; and a second characteristic modifier modifying the second correction characteristic, in response to setting of decreasing the lightness value by the lightness setting device.

Abstract: An apparatus and method for enhancing device-adaptive color is disclosed. The apparatus includes an auxiliary-gamut-setting unit which sets a boundary of a device-adaptive auxiliary gamut using information on a color gamut of a source device and information on a color gamut of a desired reference color space; a gamut-conversion unit which converts the color in the gamut of the source device into the color of the set auxiliary gamut; and a gamut-mapping unit which carries out gamut mapping of the color of the auxiliary gamut to a destination gamut of an image output device.

Abstract: A bistable electro-optic display has a plurality of pixels, each of which is capable of displaying at least three gray levels. The display is driven by a method comprising: storing a look-up table containing data representing the impulses necessary to convert an initial gray level to a final gray level; storing data representing at least an initial state of each pixel of the display; receiving an input signal representing a desired final state of at least one pixel of the display; and generating an output signal representing the impulse necessary to convert the initial state of said one pixel to the desired final state thereof, as determined from said look-up table. The invention also provides a method for reducing the remnant voltage of an electro-optic display.

Abstract: A method for processing an image is provided. The method is to calculate the amount of original gray levels in a frame according to the original gray level difference between each pixel and an adjacent pixel thereof and adjusts the contrast of the frame according to the calculated amount of gray levels and the contrast difference between the current frame and the previous frame.

Abstract: A method and apparatus for generating transform-based color profiles by a measurement-based Color Management System (CMS). The measurement-based CMS generates the transform-based profile wherein the measurement-based color system is parameterized by color data and procedures. The CMS may use a reference Profile Connection Space (PCS) loaded from a measurement profile, thus enabling user configuration of the generation process. The reference PCS may also be set to include a gamut that is appropriate for an eventual color-output device. In addition, a Gamut Mapping Model (GMM) used in the generation process is user-selectable as well as a Device Model (DM). The DM may also be supplied as a pluggable module. The CMS also features user-selectable mapping from an International Color Consortium (ICC) intent to a PCS profile and to a DM. The features of the CMS may be used in an application, stand-alone profiling tool or in an operating system utility.

Abstract: In a color laser printer, the printing density of images to be formed is corrected based on a correction values stored in a control memory, For each printing operation the printer determines whether the correction values stored in the control memory matches a value stored in a backup memory. If the correction values in the control memory does not match the correction values in the backup memory, the value of a number of printed pages A serving as the printing performance is incremented by one. If the number of printed pages A is greater than a reference performance number of sheets B pre-stored in memory, then the correction values in the control memory is copied to the backup memory, and the printing operation is executed. If a “Restore correction data” command is inputted, the contents of the backup memory are copied to the control memory.

Abstract: An image processing apparatus for performing a color converting process in which image data of an original document is converted into image data expressed in a color space corresponding to a coloring material used in an output apparatus, the image processing apparatus includes: a conversion information generating unit which generates data for the color converting process when the color converting process is performed, the data corresponding to one or more images included in the image data of the original document; and a color converting unit which performs the color converting process using the data for the generated color converting process, the data corresponding to the image data of each image. The data for the color converting process includes information which is used to convert the image data of the image before conversion such that the image data is expressed in one color of the coloring material.

Abstract: A luminance nonuniformity adjustment module for eliminating luminance nonuniformities in light emitting elements determines a luminance correction coefficient for each light-emitting element through a test print. The luminance nonuniformity adjustment module comprises a provisional luminance correction coefficient calculation unit, an improper coloring degree calculation unit and a luminance correction coefficient determination unit. The provisional luminance correction coefficient calculation unit calculates a provisional luminance correction coefficient by comparing a measured density value for a grayscale chart and a predetermined target density value. The improper coloring degree calculation unit calculates an improper coloring degree, which is the degree of improper coloring that occurs when other colors are expressed when developing a specific color, from the measured density values for the grayscale chart and an unbalanced chart in which the gray balance has been altered.

Abstract: An image reading device including a plurality of image sensors configured to read image data of an original document, each of which having a reading range overlapping in a main scanning direction with an adjacent image sensor among the plurality of image sensors, and a gamma correction mechanism configured to conduct gamma correction to correct linearity of respective output characteristics of the plurality of image sensors, based on gamma correction data produced according to an output characteristic of a reference image sensor selected from the plurality of image sensors. The reference image sensor and the adjacent image sensor read identical input data, and the gamma correction mechanism compares the results, obtains a difference between the results, and adjusts the output characteristic of the adjacent image sensor to the output characteristic of the reference image sensor.

Abstract: A bistable electro-optic display has a plurality of pixels, each of which is capable of displaying at least three gray levels. The display is driven by a method comprising: storing a look-up table containing data representing the impulses necessary to convert an initial gray level to a final gray level; storing data representing at least an initial state of each pixel of the display; receiving an input signal representing a desired final state of at least one pixel of the display; and generating an output signal representing the impulse necessary to convert the initial state of said one pixel to the desired final state thereof, as determined from said look-up table. The invention also provides a method for reducing the remnant voltage of an electro-optic display.

Abstract: In printing using a plurality of chromatic color inks of different lightness interchangeable with one another in color reproduction, ink consumption is reduced while preserving the quality of the printed result. On the basis of first color data represented in terms of density of a first reference color, second color data represented in terms of density of a plurality of second reference colors is generated. The plurality of second reference colors are the ink colors. They include two same hue reference colors of different lightness interchangeable with one another when reproducing a certain color. The lookup table holds the first color data and the second color data associated with one another. For a set of densities of a plurality of second reference colors representing achromatic color of higher lightness than the reference lightness, density of the same hue reference color having lower lightness is 0.

Abstract: A driving method for a color liquid crystal display which drives the color liquid crystal display based on a video red signal, a video green signal and a video blue signal by independently applying a gamma compensation to a clamped video red signal, a clamped video green signal and a clamped video blue signal in gamma compensating circuits in order to make suitable to a red transmittance characteristic, a green transmittance characteristic and a blue transmittance characteristic. With this operation, it is possible to carry out an optimal gamma compensation suitable to a characteristic of the color liquid crystal display and to remove a gradation batter occurring in a specific color.

Abstract: An apparatus for compensating for pixel distortion while reproducing hologram data includes an extraction unit, a determination and calculation unit, a table, and a compensation unit. The extraction unit extracts a reproduced data image from a reproduced image frame including the reproduced data image and borders. The determination and calculation unit determines position values of edges of the extracted reproduced data image, and calculates average magnification error values of pixels within line data from position values of start and end point pixels thereof, which are based on the determined position values of the edges. The table stores misalignment compensation values for the pixels within the line data, wherein the misalignment compensation values correspond to predetermined references for average magnification error values.

Abstract: A method and system for optimal node placement of a color correction table first generate a high resolution color correction table. A low resolution color correction table is generated. Each node of the low resolution color correction table has a corresponding color correction value generated by interpolating the color correction values of the high resolution color correction table. A reconstructed color correction table is generated, and each of the nodes of the reconstructed color correction table has a corresponding color correction value generated by interpolating the color correction values of the low resolution color correction table using an interpolation method identical to an output device interpolation method. Differences between the color correction values of the reconstructed and the high resolution color correction table are quantified into a measure of error, and the node locations of the low resolution color correction table are adjusted, and the procedure is repeated.

Abstract: There is provided a method of changing a theme for a user interface of a computer system comprising receiving an identification of an image with which to define a color palette of a theme for rendering elements of a user interface on a color display of the computer system; analysing the image to determine at least one predominant color; and defining the color palette in response to the analysis. The image may comprise a background image selected by a user for display by the computer system. Dynamic generation of the color palette matches the user interface to colors to provide flexible and appealing themes. A computer readable memory having recorded thereon instructions to carry out this method is also provided, as well as a device comprising such memory.

Abstract: This invention is directed to an image forming apparatus which forms a color image on the basis of image information and includes an image forming unit which forms a color reference image on an image forming member on the basis of reference image information for color correction, a colorimetric unit which measures the color of the color reference image formed by the image forming unit and outputs color information, an image processing unit which generates a gray level correction table on the basis of the color information output from the colorimetric unit, and a control unit which corrects the image information on the basis of the gray level correction table generated by the image processing unit and controls the image forming unit so as to form a color image on the image forming member on the basis of the corrected image information, and an image forming method using the image forming apparatus.

Abstract: Sub-pixel rendering with gamma adjustment allows the luminance of the sub-pixel arrangement to match the non-linear gamma response of the human eye's luminance channel. For each of a subset of input sampled data indicating a region of an input image, a gamma-adjusted data value is generated for each input image data value in the subset using a local average of at least two input image data values. A sub-pixel rendering operation uses the subset of gamma-adjusted data values and the subset of input image data values to produce an output data value for each sub-pixel element on the display panel. A plurality of output data values collectively indicates an output image. The gamma adjustment allows the sub-pixel rendering to operate independently of the actual gamma of a display device. The sub-pixel rendering techniques with gamma adjustment may improve image contrast in high spatial frequency portions of an image.