Abstract: A color converting device converts input CMYK data into output color data in a predetermined different format. The color converting device comprises a contrast emphasizing unit emphasizing a contrast of the output color data corresponding to the CMYK data representing a black-character color more than a contrast of the output color data corresponding to the CMYK data representing a non-black-character color.

Abstract: An image processing apparatus that stores input image data is disclosed. The image processing apparatus includes a color space evaluating unit which evaluates a color space of the input image data by comparing the color space of the input image data with a reference color space, a frequency distribution calculating unit which calculates an appearing frequency distribution of a color included in the input image data, and a color space determining unit which determines a color space in which the input image data are to be stored by applying color control to the input image data based on the evaluated result by the color space evaluating unit and the calculated result by the frequency distribution calculating unit.

Abstract: A color converting device converts input CMYK data into output color data in a predetermined different format. The color converting device comprises a contrast emphasizing unit emphasizing a contrast of the output color data corresponding to the CMYK data representing a black-character color more than a contrast of the output color data corresponding to the CMYK data representing a non-black-character color.

Abstract: An image reproducing apparatus is operative in accordance with multiple display modes. The image reproducing apparatus includes a data reproducing unit that reproduces an image on a display based on high dynamic range image data acquired from an object and stored in memory, and a dynamic range control unit that controls the dynamic range of the image to be reproduced on the display using one of different types of dynamic range control schemes in accordance with one of the display modes.

Abstract: A color converting device converts input CMYK data into output color data in a predetermined different format. The color converting device comprises a contrast emphasizing unit emphasizing a contrast of the output color data corresponding to the CMYK data representing a black-character color more than a contrast of the output color data corresponding to the CMYK data representing a non-black-character color.

Abstract: An image output apparatus includes a receiving unit that receives first information from a first radio contact element that performs a close-range radio contact; an image processing unit that forms image data of an image to be output from the first information; and an image output unit that outputs the image to an output medium from the image data.

Abstract: A signal processing method for converting input color value information (Lab) represented in a uniform color space into a set of five output color levels of black, light black, and three chromatic colors (CMYKLk) is provided. A black output level (K) is determined based on the input color value information. Then, a light black output level (Lk) is determined based on the black output level and the input color value information. Output levels of the three chromatic colors (CMY) are also determined such that the determined output levels are colorimetrically consistent with the input color value information.

Abstract: When performing predetermined color correction/modification processing on RGB image data including red, green and blue color components so as to perform hue correction thereon, a frequency distribution of respective tone values is obtained for at least one of these red, green and blue color components of the RGB image data; it is determined from the frequency distribution whether or not the RGB image data has already undergone tone transformation; and the predetermined color correction/modification processing is performed on the RGB image data so as to perform the hue correction thereon only when it is determined that the RGB image data has not undergone tone transformation yet.

Abstract: When performing predetermined color correction/modification processing on RGB image data including red, green and blue color components so as to perform hue correction thereon, a frequency distribution of respective tone values is obtained for at least one of these red, green and blue color components of the RGB image data; it is determined from the frequency distribution whether or not the RGB image data has already undergone tone transformation; and the predetermined color correction/modification processing is performed on the RGB image data so as to perform the hue correction thereon only when it is determined that the RGB image data has not undergone tone transformation yet.

Abstract: A color image processing apparatus realizes color reproduction in a color image output apparatus by controlling the total amount of coloring material used while making full use of the color reproduction range of the color image output apparatus. To this end, a signal C′M′Y′K′, obtained after a &ggr; conversion (gamma conversion), is converted into an amount of ink drops V (CMYK) at a conversion unit. Then, at a total ink drop quantity control unit, a total ink quantity of the amount of ink drops converted at the conversion unit and a limit value (maximum total ink drop quantity) stored in a maximum total ink quantity memory unit are compared, and the total ink quantity is controlled to be lower than the limit value. Then, the controlled amount of ink drops is converted into a recording control signal C″M″Y″K″ at a control signal conversion unit.

Abstract: An image processing apparatus, which includes an input unit inputting a color signal of a color space, a designating unit designating a color range according to the input color signal, a black amount determining unit determining an amount of black for the input color signal by referring to a black generation condition corresponding to the designated color range, wherein the designated color area is an area where a difference between a maximum amount of black and a minimum amount of black is small.

Abstract: A color image processing apparatus realizes color reproduction in a color image output apparatus by controlling the total amount of coloring material used while making full use of the color reproduction range of the color image output apparatus. To this end, a signal C′M′Y′K′, obtained after a &ggr; conversion (gamma conversion), is converted into an amount of ink drops V (CMYK) at a conversion unit. Then, at a total ink drop quantity control unit, a total ink quantity of the amount of ink drops converted at the conversion unit and a limit value (maximum total ink drop quantity) stored in a maximum total ink quantity memory unit are compared, and the total ink quantity is controlled to be lower than the limit value. Then, the controlled amount of ink drops is converted into a recording control signal C″M″Y″K″ at a control signal conversion unit.

Abstract: A color converting device converts input CMYK data into output color data in a predetermined different format. The color converting device comprises a contrast emphasizing unit emphasizing a contrast of the output color data corresponding to the CMYK data representing a black-character color more than a contrast of the output color data corresponding to the CMYK data representing a non-black-character color.

Abstract: When performing predetermined color correction/modification processing on RGB image data including red, green and blue color components so as to perform hue correction thereon, a frequency distribution of respective tone values is obtained for at least one of these red, green and blue color components of the RGB image data; it is determined from the frequency distribution whether or not the RGB image data has already undergone tone transformation; and the predetermined color correction/modification processing is performed on the RGB image data so as to perform the hue correction thereon only when it is determined that the RGB image data has not undergone tone transformation yet.

Abstract: A color matching process which can respond to a type of object to be processed is automatically performed by a printer driver. The color conversion method converts first color image information into second color image information output to a color image outputting apparatus. It is determined whether or not the first color image information includes an instruction for designating a color matching method. A type of each object included in the first color image information is discriminated when the first color image information does not include the instruction for designating a color matching method. One of a plurality of color matching methods suitable for the type of each object is selected in accordance with previously prepared correspondence information between each type of object and each color matching method.

Abstract: A color conversion processing method which can apply an optimum color matching process to each color by selecting an appropriate color matching process for each color. Color image information includes at least one drawing object to be drawn by a color image outputting apparatus so as to output the color image information after conversion to the color image outputting apparatus. It is determined whether each color of the drawing object in the input color image information is a previously designated specific color. A previously designated color matching process is applied to the color of the drawing object only when the color of the drawing object is the specific color so that the color determined to be the specific color is not subjected to the color matching process.

Abstract: An image processing system includes an input part for reading an image from a color document containing a multilevel gradation graphic image and a text image, a region separator part for separating the image into a plurality of elemental blocks having M.times.N picture elements according to a type of image data that is contained in each elemental block, whether the elemental block contains a black-and-white line portion of the image or a halftone portion of the image, and an encoding part for encoding image data in the black-and-white line portion through an encoding process appropriate for bi-level image data and for encoding image data in the halftone portion through an encoding process appropriate for multilevel gradation image data so as to produce a compressed image.

Abstract: A density converting unit converts densities concerning respective color components in color-image data for each pixel so as to change the densities concerning respective color components for the pixel into lower densities when the densities concerning respective color components for the pixel are determined to be white or approximately white. The density converting unit converts the densities concerning color components in the color-image data for each pixel so as to change the densities concerning respective color components for the pixel into densities corresponding to white ones when all of the densities concerning respective color components for the pixel are lower than a predetermined threshold density value.

Abstract: A method of encoding two-dimensional original image data through fast cosine transformation FCT, the method including steps of inputting each block of N.times.N picture elements from the image data and transforming the block into N.times.N values of the first FCT coefficients by a first N.times.1 FCT circuit. The first N.times.1 FCT circuit uses multiplication factors of prescribed butterfly operations, the factors being multiplied by .sqroot.2. The method further includes storing the first FCT coefficients in a memory and transforming the first FCT coefficients into N.times.N values of second FCT coefficients by a second N.times.1 FCT circuit, the second N.times.1 FCT circuit using multiplication factors of prescribed butterfly operations, the factors being multiplied by .sqroot.2. The method further includes quantizing each of the second FCT coefficients using one of N.times.N corresponding values from a quantization table, the corresponding values being multiplied by 2.