Abstract: A color management apparatus includes at least one processor. The processor performs conversion between a first signal value and a first chromaticity value through a color profile. The color profile is created using a second chromaticity value of a color chart formed of at least one ink composition containing a liquid crystal compound and a chiral compound, and a second signal value. Each of the second chromaticity value and the second signal value is associated with amounts of the liquid crystal compound and the chiral compound.

Abstract: There are provided a chart manufacturing apparatus, a chart manufacturing method, a program, and an image forming system that do not need to switch backgrounds in a case of measuring a chart using two types of backgrounds having colors different from each other. The chart manufacturing apparatus that forms, on a transparent substrate, a chart (102) measured by applying a first background color and a second background color, forms a first measurement background image (130) on a transparent substrate (100) using a coloring material corresponding to a first background color, forms a first patch group (122) including one or more first patches (126) using a coloring material of a first color at a position corresponding to the first measurement background image, and forms a second patch group (120) including one or more second patches (124) at a position where the first measurement background image is not formed.

Abstract: The method includes creating: a first table defining conversion relationship from a signal of a first standard color to which limitation of a total amount of ink is not applied into a signal of a second standard color to which the limitation is applied; a second table defining conversion relationship from the signal of the second standard color into a first expansion color signal to which the limitation is applied; a third table defining conversion relationship from a color signal in a device-independent color space corresponding to the signal of the second standard color into a color signal in a device-dependent color space; and a fourth table (color profile) defining conversion relationship from a color signal in the device-independent color space corresponding to the signal of the second standard color into a second expansion color signal in the device-dependent color space by the third and second tables.

Abstract: The method includes creating: a first table defining conversion relationship from a signal of a first standard color to which limitation of a total amount of ink is not applied into a signal of a second standard color to which the limitation is applied; a second table defining conversion relationship from the signal of the second standard color into a first expansion color signal to which the limitation is applied; a third table defining conversion relationship from a color signal in a device-independent color space corresponding to the signal of the second standard color into a color signal in a device-dependent color space; and a fourth table (color profile) defining conversion relationship from a color signal in the device-independent color space corresponding to the signal of the second standard color into a second expansion color signal in the device-dependent color space by the third and second tables.

Abstract: When image is formed by a liquid ejection head, input image data is subjected to conversion processing including tone conversion using a first look-up table (LUT) and density correction or non-uniformity correction in nozzle units using second LUTs. Ink use amount in image formation is predicted from reduced image data which is generated from the input image data. In this, the calculation is made more efficient by applying a third LUT which is compiled according to requirements from the second LUTs, to the reduced image data, rather than using the second LUTs directly. Since the image conversion processing is carried out which combines the first LUT for tone conversion and the third LUT corresponding to the non-uniformity correction, and the ink amount distribution data is calculated from the reduced image data after the conversion, then it is possible to ascertain an accurate ink amount which reflects the image adjustment conditions.

Abstract: An apparatus includes: a first lookup table storage device which stores a first lookup table; a second lookup table storage device which stores a second lookup table; a halftone table storage device which stores a halftone table; a third lookup table generating device which generates a third lookup table by extracting a portion of the data from the second lookup table; a third lookup table storage device which stores the third lookup table; an evaluation processing device which performs calculation for evaluating a liquid ejection volume, on the basis of the evaluation input signal, the first lookup table, the third lookup table, the halftone table and the liquid volume per dot; and an adjusting device which adjusts the ejection volume on the basis of the evaluation results, in such a manner that the liquid ejection volume does not exceed a specified value.

Abstract: An apparatus includes: a first lookup table storage device which stores a first lookup table; a second lookup table storage device which stores a second lookup table; a halftone table storage device which stores a halftone table; a third lookup table generating device which generates a third lookup table by extracting a portion of the data from the second lookup table; a third lookup table storage device which stores the third lookup table; an evaluation processing device which performs calculation for evaluating a liquid ejection volume, on the basis of the evaluation input signal, the first lookup table, the third lookup table, the halftone table and the liquid volume per dot; and an adjusting device which adjusts the ejection volume on the basis of the evaluation results, in such a manner that the liquid ejection volume does not exceed a specified value.

Abstract: When a color image is formed on a transparent sheet with a white color material as background color material and C, M, Y, K color materials as process color materials and has colors determined by the total amount of the color materials that are applied per unit area, image formation failures such as ink drooping and ink fixation failures are prevented from occurring. Of four colors or more including white represented by a CMYKW 1-bit pixel signal, the three colors C, M, Y (gray) are replaced with the color K. After the replacement, for three or more of C, M, Y, K, no white color ink is applied since the transparent sheet is opaque without the white color ink. This control process is effective to reduce the number of applications, i.e., the total amount of inks applied, thereby preventing image formation failures such as ink drooping from occurring.

Abstract: A device CMYKW 8-bit signal supplied to an image output device is controlled so that the total amount of color materials per unit area will not exceed an upper limit therefor. Until a provisional total amount of color materials reaches a value 765, a device CMYKW 8-bit signal is output with the white color material being kept at a maximum gradation level 255. When the provisional total amount is in the range between the values 765 and 1020, the amount of the white color material is reduced from the maximum gradation level to 0 to keep the total amount be the value 765. When the provisional total amount is in the range between the values 1020 and 1275, a UCR process is performed while the amount of the white color material is kept at 0. Consequently, the total amount is kept 765 of 300% or lower all the time.

Abstract: When a color image is formed on a transparent sheet with a white color material as background color material and C, M, Y, K color materials as process color materials and has colors determined by the total amount of the color materials that are applied per unit area, image formation failures such as ink drooping and ink fixation failures are prevented from occurring. Of four colors or more including white represented by a CMYKW 1-bit pixel signal, the three colors C, M, Y (gray) are replaced with the color K. After the replacement, for three or more of C, M, Y, K, no white color ink is applied since the transparent sheet is opaque without the white color ink. This control process is effective to reduce the number of applications, i.e., the total amount of inks applied, thereby preventing image formation failures such as ink drooping from occurring.

Abstract: A color conversion definition (CCD) creating method of creating CCD converting coordinate points within a color reproduction area (CRA) of 1st device mediating between an image and image data, in 1st RGB color space, depending on 1st device, into coordinate points within CRA of printing in CMYK color space for printing, has 1st CCD creating step of creating 1st CCD for converting the coordinate points within CRA of 1st device in 1st RGB color space into coordinate points within CRA of 2nd device mediating between an image and image data, in 2nd RGB color space, depending on 2nd device, CRA of 2nd device being closer to CRA of the printing than 1st device, and 2nd CCD creating step of creating 2nd CCD for converting the coordinate points within CRA of 2nd device in 2nd RGB color space into coordinate points within CRA of printing in CMYK color space.

Abstract: A combined profile is created through a first step of deriving a coordinate component of a black on a color space for CMYK dot % for a printer associated with a predetermined representative coordinate in the color space for CMYK dot % for printing, on the representative coordinate, based on a printing profile and a printer profile; a second step of deriving a coordinate component of the black on the color space for CMYK dot % for a printer associated with coordinates other than the representative coordinate, based on the coordinate component of the black associated with the representative coordinate; and a step of deriving coordinate components of cyan, magenta and yellow on the color space for CMYK dot % for a printer, on the coordinates corresponding to the coordinate components derived in the first and second steps, based on the derived coordinate components of the black, the first and second color conversion definitions.

Abstract: In a color conversion definition correcting method, image data for a target device is converted into image data for an output device using a color conversion definition made by combining a profile for a target device with a profile for an output device, and an image is output according to the converted image data. The profile for the target device is corrected as follows. Coordinate values out of a color gamut for the output device in the calorimetric color space, of coordinate values in a color gamut for the target device in the calorimetric color space, all go in the color gamut for the output device. Likely, calorimetric values for the color chart output from the target device are corrected. The corrected profile for the target device is further corrected according to the calorimetric values after correction and the calorimetric values of the color chart output from the output device.

Abstract: There are disclosed a profile producing method and a profile producing apparatus for producing a profile in a device for mediating between image data including color data and a color image, such as a color scanner and a color printer. In the process of producing the profile, a smoothing processing is applied.

Abstract: There are disclosed a profile producing method and a profile producing apparatus for producing a profile in a device for mediating between image data including color data and a color image, such as a color scanner and a color printer. In the process of producing the profile, a smoothing processing is applied.

Abstract: There is provided a color conversion processing method and the like, which are capable of performing a data processing for images with a common processing system independently of a printer and also capable of performing a flexible alteration of the processing method, even if it is concerned with the printer restricted in the above-mentioned matter. In the event that there is a restriction on a total value of the respective values of CMYK on one pixel for instance, for a respective printer, image data is converted into image data suitable for the printer involved in the restriction. Processing in a printer conversion processing section, which is hitherto performed by the hardware operating processing, is implemented in form of a profile (referred to as a printer processing conversion profile). The printing profile and the printer profile are combined with the printer processing conversion profile to create a combined profile. The color conversion processing is performed in accordance with the combined profile.

Abstract: A color reproduction characteristic is readily corrected with great accuracy. A color chart, of which dot % is different from that of a color chart involved in creation of a printing profile, and which is not many in the number of color patches, is outputted by both printing machine and proofer. Color measurement values of the color charts thus obtained are compared with one another to correct the printing profile.

Abstract: This invention provides a color conversion system, a color conversion apparatus and color conversion program storage medium which include a correction defining section that defines a range correction to correct a brightness range of a color according to an operation and a range correcting section that performs a range correction defined by the correction defining section to multiple conversion subjects to which the color conversion is performed, or include a gain defining section that defines a gain adjustment in at least one of a first device color space and a second device color space according to an operation apart from a first color conversion definition and a second color conversion definition and a gain adjustment section that performs the gain adjustment defined by the gain defining section to the multiple conversion subjects to which the color conversion is performed.

Abstract: There are disclosed a profile producing method and a profile producing apparatus for producing a profile representative of the association between the colors on a color image and the color data in accordance with which the color image is outputted, in an output device such as a color printer and a printing machine for outputting color images in accordance with image data including color data. From among a plurality of existing profiles (tables), a suitable table is selected in accordance with an evaluation based on dot gains. A new profile is produced in accordance with the selected table and colorimetry data of a color chart involved in small number of patches.

Abstract: There are disclosed gradation correction curve producing method and apparatus for producing a gradation correction curve for correcting a gradation of an image. Density of monochromatic density patches for C, M, Y is measured to determine a first gradation correction curve, and colorimetry of gray density patches consisting of a combined color of C, M, Y is performed to determine a second gradation correction curve for each monochrome of C, M, Y determined from colorimetry values. A gradation correction curve for each monochrome of C, M, Y for gradation correction is determined using the first gradation correction curve and the second gradation correction curve.