An image forming apparatus includes an image forming device and circuitry. The image forming device forms an image on a recording medium, based on an image forming condition. The circuitry determines a position of the image formed on the recording medium by the image forming device, based on a detection signal of a pattern formed on the recording medium by the image forming device and reference position information of the pattern on the recording medium. The circuitry determines a reference position of the pattern differently depending on the image forming condition.

An image forming system includes: an image former that forms a label image on a long sheet conveyed in a sheet conveyance direction on a basis of a print job; an image defect detector that detects an image defect of the label image that is formed; and a sheet conveyer that conveys the long sheet in accordance with the label image where the image defect is detected after execution of the print job has been completed.

A print system having an information processing apparatus and a printing apparatus configured to receive a print job from the information processing apparatus and execute printing. The information processing apparatus sets so as to insert a chart sheet on which patches for tone correction have been printed for the print job. In a case where the print job includes a setting to insert the chart sheet, the printing apparatus controls whether or not to insert the chart sheet based on a type of sheet to be used in the print job.

Aspects of the disclosure provide for a method. In some examples, the method includes printing a target plot comprising a color ramp, scanning the target plot via a first image scanner to determine first scan results indicating a relationship between a scanned measurement determined by the first image scanner and lightness of a scanned portion of the target plot, scanning the target plot via a second image scanner to determine second scan results indicating a relationship between a scanned measurement determined by the second image scanner and lightness of the scanned portion of the target plot, and determining a lookup table indicating a difference determined based on the first scan results and the second scan results.

An image processing apparatus comprises: an image forming unit configured to form an image on a recording medium using a plurality of color materials on the basis of first image data showing an image; and an estimating unit configured to estimate a characteristic of each one of the plurality of color materials in a target region on the formed image on the basis of second image data obtained by reading the formed image. The estimating unit selects an estimation processing unit to use from among a plurality of estimation processing units used for different estimation methods on the basis of a combination of the color materials in the target region.

A printing system includes a printing unit, an operation unit, and a control unit. The printing unit prints an image on a sheet, conveys the sheet to a reading unit, and performs adjustment for printing an image on the sheet based on an image read by the reading unit. The control unit performs an operation of controlling to execute a manual adjustment function for adjusting predetermined adjustment items based on adjustment values received via the operation unit after authentication of an operator. The control unit performs another operation of controlling to execute an automatic adjustment function for adjusting the predetermined adjustment items based on the image read by the reading unit without the authentication of the operator.

An image forming apparatus includes an image forming portion, a transfer unit, a power supply, and a reader. A test chart is formed by transferring test images to a recording material while applying test voltages from the power supply to the transfer unit. A transfer voltage to be applied to the transfer unit during transfer is set based on the read test images. A reference image is formed on the test chart. The reader reads the test chart by scanning the test chart from a first position to a second position that falls within the test images. The first position falls within a boundary of the recording material on which the test chart is formed and falls outside the test images. Based on the reference image, the result of the reader reading the test chart is obtained by scanning the test chart from the first position to the second position.

A printing system includes a printing unit configured to print an image on a sheet, a receiving unit configured to receive an adjustment value from a user, first and second adjustment units, and a control unit. The first adjustment unit conveys the sheet on which the image is printed by the printing unit to a reading apparatus, and performs a first adjustment based on an image read by the reading apparatus. The second adjustment unit performs a second adjustment based on the adjustment value received by the receiving unit. The control unit prevents the first adjustment from being performed for a sheet of a size where the first adjustment is not properly performed among sheets for the printing unit to print an image on. The control unit does not prevent the second adjustment from being performed for the sheet of the size where the first adjustment is not properly performed.

An image processing apparatus includes an acquisition unit configured to acquire a plurality of image data read from a plurality of areas of a print product, and an evaluation unit configured to obtain degrees of streaks in the plurality of areas and tilts in the plurality of areas using the plurality of image data and evaluate image quality of the print product based on the degrees and the tilts.

An image forming system including: a reading unit configured to read, through a transparent member, an image on a first sheet conveyed by a conveyance unit; an opposed member provided opposite to the reading unit with respect to the transparent member, the first sheet passing through a gap between the opposed member and the transparent member; and at least one processor configured to control, based on the image read by the reading unit, a geometric characteristic of an image to be formed on a second sheet by an image forming portion, and control a changing unit to change the size of the gap to a first size when the thickness of the first sheet is a first thickness, and to a second size larger than the first size when the thickness of the first sheet is a second thickness larger than the first thickness.