Abstract: There is provided a method of creating a color chart for color evaluation used in color evaluation, including: an obtaining step of obtaining standard color chart data corresponding to a standard color chart including a plurality of patches; a display step of displaying an evaluation target image on a display screen; a setting step of setting an area in the evaluation target image, which is used to create a color chart for color evaluation; a computing step of computing color element data which represent color features of an image within the set area based on image data of the set area; and a creating step of creating the color chart for color evaluation by extracting patch data corresponding to the computed color element data from the standard color chart data.

Abstract: An image forming apparatus has a calibration mode in which a calibration image is formed on a print medium to correct image forming conditions. The image forming apparatus detects print medium information to determine, on the basis of the print medium information, whether the print medium is a sheet recommended as a print medium for use in the calibration mode. The image forming apparatus sets calibration conditions corresponding to the determined recommended sheet. The image forming apparatus corrects the image forming conditions on the basis of the set calibration conditions.

Abstract: Upon observing homogeneity in page image by the human eye, a permissible level associated with color reproduction with respect to an identical color signal changes depending on the distance from an interest point. Since the conventional homogeneity in page image evaluation scheme doesn't take the above characteristics into consideration, the correlation between a finished image and the evaluation result cannot be exploited fully. Hence, image data, which forms an image with identical density within a range to be evaluated in one page, is output to a printer to measure reflection characteristics of the image at points on output of the printer. One point is set as a reference point, and distances between the reference point and the remaining points, and differences of the reflection characteristic between the reference point and the remaining points are calculated. The image quality within the range is evaluated based on the distances and differences.

Abstract: Color reproducibility needs to be evaluated in consideration of the influence of homogeneity in page image. Hence, a first chart is formed from an image of a uniform density of a region to be evaluated, and data associated with the spectral reflectances of plural points on the first chart are input. Based on the data obtained from the first chart, color differences between a predetermined point and other points on the first chart are calculated. When the calculated color differences fall within a permissible range of heterogeneity of colors in the region, a second chart is formed from an image corresponding to a color target, and data associated with the spectral reflectances of plural points on the second chart are input. Color differences are calculated from the data obtained from the second chart and data associated with the spectral reflectance of the color target.

Abstract: An image forming apparatus has a calibration mode in which a calibration image is formed on a print medium to correct image forming conditions. The image forming apparatus detects print medium information to determine, on the basis of the print medium information, whether the print medium is a sheet recommended as a print medium for use in the calibration mode. The image forming apparatus sets calibration conditions corresponding to the determined recommended sheet. The image forming apparatus corrects the image forming conditions on the basis of the set calibration conditions.

Abstract: An ICC profile includes brief gloss information indicating glossy/matte attribute as attribute information, however, gloss matching cannot be performed with the 2 options. In a case where embedding of glossiness information into the ICC profile is designated, glossiness information is obtained from a color chart placed on an original plate of a color copier, and the obtained glossiness information is described in a private tag of the ICC profile.

Abstract: It enables to construct a flexible device environment in consideration of POD, office and various use environments. To do so, a job processing method is applied to a system including an image processing device capable of executing printing of data of a job of a storage unit capable of storing data of plural jobs including at least one of first job of first processing condition, second job of first processing condition and third job of second processing condition. In the method, it causes the image processing device to finish the printing of the third job after both the printings of first and second jobs are executed, when the image processing device is operated in first sequence, and it causes the image processing device to start the printing of third job before at least the printing of second job is finished, when the image processing device is operated in second sequence.

Abstract: An image forming apparatus appropriately adjusts an image forming conditions even if a halftone-processed image data is inputted. The image forming apparatus forms a patch image by applying a halftone process which is substantially equivalent to the halftone process which has been previously performed for the inputted image data. The image forming apparatus detects the density of the formed patch image and adjusts the image forming conditions according to the detected density.

Abstract: An ICC profile includes brief gloss information indicating glossy/matte attribute as attribute information, however, gloss matching cannot be performed with the 2 options. In a case where embedding of glossiness information into the ICC profile is designated, glossiness information is obtained from a color chart placed on an original plate of a color copier, and the obtained glossiness information is described in a private tag of the ICC profile.

Abstract: An image forming apparatus that is capable of generating highly accurate read timing of a patch image, thereby achieving highly accurate density adjustment and improving color stability. A patch image for color adjustment is read in read timing generated when a trigger bar is detected. The patch image and the trigger bar that are to be read by a color sensor are formed on a transfer material. Image formation is executed by a printer controller in an image forming condition set differently for the trigger bar and for the patch image.

Abstract: An image processing apparatus for forming an image using at least three color materials includes a first generation device for generating a plurality of patches of secondary colors composed of color materials of two different colors; a first measurement device for measuring the patches; a first correction characteristic calculation device for calculating gradation-correction characteristics corresponding to each of the two color materials; a second generation device for generating a group of patches in accordance with an image signal for the two different color materials and an image signal for color materials other than the two color materials by using an image signal corrected on the basis of the gradation-correction characteristics; a second measurement device for measuring patches generated by the second generation device; and a second correction characteristic calculation device for calculating gradation-correction characteristics of image signals for color materials other than the two different color ma

Abstract: An image forming apparatus appropriately adjusts an image forming conditions even if a halftone-processed image data is inputted. The image forming apparatus forms a patch image by applying a halftone process which is substantially equivalent to the halftone process which has been previously performed for the inputted image data. The image forming apparatus detects the density of the formed patch image and adjusts the image forming conditions according to the detected density.

Abstract: An image forming apparatus that is capable of generating highly accurate read timing of a patch image, thereby achieving highly accurate density adjustment and improving color stability. A patch image for color adjustment is read in read timing generated when a trigger bar is detected. The patch image and the trigger bar that are to be read by a color sensor are formed on a transfer material. Image formation is executed by a printer controller in an image forming condition set differently for the trigger bar and for the patch image.

Abstract: A method for measuring an amount of toner on a recording medium that can accurately measure the toner amount. Information on the recording medium to which the toner is fixed is acquired. The toner fixed to the recording medium is irradiated with laser light. A light intensity distribution of reflected light of the laser light is detected. The amount of the toner on the recording medium is calculated on the basis of the acquired recording medium information and the detected light intensity distribution.

Abstract: An image forming apparatus includes an image bearing member for carrying a toner image; toner image forming means for forming a toner image on the image bearing member; detecting means for optically detecting a mark bonded on the image bearing member; adjusting means for adjusting the toner image forming means on the basis of a output of the detecting means; a protection sheet removably adhered to the mark, the protection sheet being capable of passing detecting light of the detecting means, wherein an adhesion of the protection sheet to the mark is smaller than an adhesion of the mark to image bearing member.

Abstract: An image color correction method and an image forming apparatus are provided, which are capable of correcting an image color with much higher accuracy. A first light (red light) is irradiated on patch image (for example, an image of cyan color) formed on a sheet by the image forming apparatus, and a second light (red light) is irradiated on the vicinity of the patch image on the sheet, respectively by the image forming apparatus. The light amount of the second light is adjusted so that the brightness of the second light coincides with the brightness of the patch image irradiated by the first light. Based on the light amount adjusted for correcting the color of the image outputted by the image forming apparatus, the image forming condition of the image forming apparatus is set.

Abstract: An image forming apparatus forms an image for a latent image portion of which density is relatively higher with a dark color image forming portion, and forms an image for a background portion of which density is relatively decreased or of which image disappears, with a light color image forming portion, with respect to portions of forgery-preventing pattern image in which the density contrasts for the portions mutually differ after copying.

Abstract: An image forming apparatus which is capable of decreasing the failure rate by improving a photocatalytic material and utilization efficiency thereof, and by decomposing substances that cannot be completely removed with a cleaning member or by not causing the substances to adhere. A light emitting unit irradiates an object to be irradiated with light. A light receiving unit receives reflected light from the irradiated object. A protection sheet containing a photocatalytic material is disposed so as to cover the light emitting unit and light receiving unit. The light emitting unit emits light of a wavelength range adapted to a bandgap width of the protection sheet, and the light receiving unit has sensitivity in a wavelength range of light emitted from the light emitting unit.

Abstract: An ICC profile includes brief gloss information indicating glossy/matte attribute as attribute information, however, gloss matching cannot be performed with the 2 options. In a case where embedding of glossiness information into the ICC profile is designated, glossiness information is obtained from a color chart placed on an original plate of a color copier, and the obtained glossiness information is described in a private tag of the ICC profile.

Abstract: An ICC profile includes brief gloss information indicating glossy/matte attribute as attribute information, however, gloss matching cannot be performed with the 2 options. In a case where embedding of glossiness information into the ICC profile is designated, glossiness information is obtained from a color chart placed on an original plate of a color copier, and the obtained glossiness information is described in a private tag of the ICC profile.