Abstract: An image forming apparatus that is capable of reducing a sequential variation of graininess and keeping imaging quality. An exposure unit exposes the photoconductor to a light beam to form an electrostatic latent image. A development unit develops the electrostatic latent image with a toner. A change unit changes a height of toner image by changing an exposure spot area of the light beam on the photoconductor. A formation unit forms test patterns corresponding to different exposure spot areas on a recording sheet. A read unit reads the test patterns. A control unit detects graininess of each test pattern based on information about the test patterns read by the read unit, determines an exposure spot area where the graininess becomes good relatively, and controls the height of toner image on the photoconductor by setting the exposure spot area determined so as to be an exposure spot area for image formation.

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: Restricting a screen line number to prevent degradation in graininess depending on the type of recording paper causes a problem in which the image quality of output matter deteriorates. An image forming apparatus according to the present invention changes an exposure area for one pixel used in image formation in accordance with recording paper in consideration of differences in the influence of the height of toner on graininess depending on recording paper.

Abstract: This invention provides a display control apparatus and control method, which allow the operator to easily identify the correspondence between the patch icons and their color difference values. To accomplish this, the display control method of this invention includes an icon displaying step of displaying a plurality of color difference values computed based on a first data group and second data group associated with spectral reflectance characteristics as a plurality of patch icons. The display control method includes a numeric value displaying step of displaying the color difference values represented by the patch icons in one of a first display format that displays, as numeric values, the color difference values within display regions of the patch icons, and a second display format that displays, as numeric values, the color difference values above display regions of a plurality of patch icons.

Abstract: The image forming apparatus includes image forming device for forming an image, switching device for switching resolution of an image formed by the image forming device, processing device for performing stabilization processing for stabilizing quality of the image formed by the image forming device and changing device for changing a processing procedure of the stabilization processing in accordance with the resolution switched by the switching device. With these features, it is possible to avoid deterioration of image quality even if the resolution is switched.

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: This invention provides a display apparatus, control method, and control program, which display hue differences and color difference values of respective patches as lists, and display the hue direction of the hue difference of each individual patch on a chromaticity diagram in an easy-to-understand manner. To accomplish this, a display method of this invention includes a specifying step of specifying a color determined by a hue difference calculated from first and second values associated with spectral reflectance characteristics, and a display step of displaying the color specified in the specifying step as a graphical object. The specified color is specified as a representative color that indicates a hue on a chromaticity diagram to which the hue difference biases.

Abstract: Restricting a screen line number to prevent degradation in graininess depending on the type of recording paper causes a problem in which the image quality of output matter deteriorates. An image forming apparatus according to the present invention changes an exposure area for one pixel used in image formation in accordance with recording paper in consideration of differences in the influence of the height of toner on graininess depending on recording paper.

Abstract: An image forming apparatus includes an image forming station for forming a pattern image on a recording material; an image reading station for reading a pattern image formed on a recording material by the image forming station; and a tone gradation corrector for calculating a halftone dot area property on the basis of the density of the pattern image read by the image reading station and for executing tone gradation correction in the image forming station on the basis of the calculated halftone dot area property.

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 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 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: 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 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: A printing system includes printing apparatuses connected to a network. A control apparatus of the printing system may send a print job to each printing apparatus and instruct each printing apparatus to execute the print job. When a first printing apparatus is instructed to execute the print job, the control apparatus makes a substitute printing reservation. The substitute printing reservation is for a second printing apparatus to execute the print job instead of the first printing apparatus. The second printing apparatus is set to a waiting state in which the second printing apparatus waits to execute the print job instead of the first printing apparatus.

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

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.