A digital printing system incorporating in-track position corrections includes one or more printing subsystems, a data processing system; and a digital memory for storing a representation of an in-track position correction function, wherein the in-track position correction function is a non-linear function that specifies in-track position corrections to be applied as a function of cross-track position, and wherein the representation of the in-track position correction function includes the cross-track positions and transition direction of transitions in the in-track position correction function. The digital printing system is adapted to print digital images using a printing process that includes receiving digital image data for a digital image to be printed, determining corrected image lines by resampling the digital image data responsive to the stored representation of the in-track position correction function, and modifying the corrected image lines to provide anti-aliasing pixels at cross-track positions adjacent to transitions in the in-track position correction function.

A digital printing system incorporating in-track position corrections includes one or more printing subsystems, a data processing system; and a digital memory for storing a representation of an in-track position correction function, wherein the in-track position correction function is a non-linear function that specifies in-track position corrections to be applied as a function of cross-track position, and wherein the representation of the in-track position correction function includes the cross-track positions and transition direction of transitions in the in-track position correction function. The digital printing system is adapted to print digital images using a printing process that includes receiving digital image data for a digital image to be printed, determining corrected image lines by resampling the digital image data responsive to the stored representation of the in-track position correction function, and modifying the corrected image lines to provide anti-aliasing pixels at cross-track positions adjacent to transitions in the in-track position correction function

An image forming system includes an image forming apparatus, a fixing device, a varnish image forming apparatus, an image reading portion, and a controller. The controller corrects first image data depending on first detection image data on a toner image formed on a first recording material and read by the image reading portion, and then depending on the corrected first image data, a toner image is formed on a second recording material subsequent to the first recording material. The controller corrects second image data depending on second detection image data on a varnish image read by the image reading portion, and then depending on the corrected second image data, a varnish image is formed on the second recording material.

Provided is an image forming apparatus including a printer controller configured to form an image on a sheet, a storage unit configured to store a plurality of adjustment conditions for adjusting a position on the sheet at which the image is to be formed, and a CPU. The CPU selects one of the plurality of adjustment conditions, adjusts the position at which the image is to be formed based on the selected adjustment condition, and causes the printer controller to form the image on the sheet.

An image processing apparatus includes: an extractor that divides image data in block units and extracts a maximum value and a minimum value of each block from the compressed image data; an edge detector that detects an edge at a front end or a rear end of an image; a correction value calculator that corrects the maximum value, or the maximum value and the minimum value of each block positioned in a certain range from the front end or the rear end and calculates a maximum value and a minimum value after the correction; and a converter that determines a conversion formula of a pixel value by using the maximum value and the minimum value before the correction and the maximum value and the minimum value after the correction and converts each pixel value of the image data obtained by decompressing the compressed data so as to apply sweeping correction.

The present invention pertains to an image forming apparatus that includes a latent image bearer, an exposure device, a detector, and processing circuitry. The exposure device exposes the latent image bearer to form a latent image based on image data. The detector detects density unevenness, in a main scanning direction, of a toner image obtained by developing the latent image. The processing circuitry corrects only an exposure amount of the exposure device based on the density unevenness to form an image portion with a higher gradation than a prescribed gradation, the processing circuitry further configured to correct the exposure amount and the image data based on the density unevenness in the main scanning direction detected by the detector to form an image portion with a gradation equal to or lower than the prescribed gradation.

An image forming apparatus includes: a conveyer that conveys continuous paper through a conveying path; a detector that detects a mark on the continuous paper conveyed by the conveyer; an image former that is provided on a subsequent stage side of the detector and forms an image on the continuous paper; and a hardware processor that causes the image former to start forming an image according to a position setting for forming an image on the continuous paper using the image former after a mark on the continuous paper is detected, wherein the hardware processor adjusts the position setting on the basis of a start position determined according to an image formation state.

An image reading apparatus includes: a paper path; an image reader which reads a side of the sheet conveyed along the paper path in a reading position; a sheet support member located opposite to the image reader to support a rear surface opposite to a surface to be read of the sheet; a spectrophotometer which colorimetrically measures color of an image formed on the sheet; and an image reading housing which accommodates the image reader and the spectrophotometer. The image reader includes: a reading housing; and a drawer guide provided in the reading housing such that it can be drawn from the image reading housing, and maintains the distance between a light transmitting member housed in the reading housing and the sheet support member to be greater than a reading distance lower limit. The drawer guide transfers heat to the outside of the reading housing.

An image forming apparatus includes: a specification unit configured to perform surface specification processing for specifying a reflective surface that deflects light; a correction unit configured to perform correction processing for correcting image data in accordance with which reflective surface deflects light; and a control unit configured to control so as to cause scanning of a first photosensitive member to start before the surface specification processing completes, and control so as to, after the surface specification processing completes, cause the correction processing to be performed, with respect to image data for causing light to be emitted from a second light source and in accordance with a specification result of the surface specification processing, and cause scanning of the second photosensitive member to start.

An image forming apparatus includes: multiple image carriers holding developers; multiple potential detectors that are mounted in a first scanning direction on each of the image carriers and detect surface potentials of the image carriers; an intermediate transfer body to which the developers held by the image carriers are transferred; and multiple density detectors that are mounted in the first scanning direction of the intermediate transfer body and detect densities of the developers transferred to the intermediate transfer body. A subset of the potential detectors is mounted at a location corresponding to a location where the density detectors are mounted and a subset of the potential detectors is mounted at a location that is common to the image carriers.