Provided are an image forming system and a method for detecting glossiness capable of accurately detecting glossiness in various media having different conditions.

The image forming system includes a sensor unit including a light source that irradiates a medium being conveyed with light and a gloss sensor that receives light emitted from the light source and specularly reflected on the medium and detects a diffusion distribution of light in the medium, and a detection condition setting unit that identifies a type of the medium being conveyed and sets a light amount of the light source and/or exposure time of the gloss sensor at the time of glossiness detection in accordance with the type of the medium. The image forming system further includes a glossiness detector that detects glossiness of the medium from a diffusion distribution of light detected by the gloss sensor under the detection condition set by the detection condition setting unit.

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.

A reading apparatus includes a reader, a conveyor, motors and a hardware processor. The reader reads a surface of a recording medium with an image formed. The conveyor includes rollers disposed along a conveyance path that passes through a reading area of the reader, and conveys the recording medium being laid across the rollers. The motors rotate the rollers. The hardware processor controls operations of the motors such that the rollers located farther downstream in a conveyance direction of the recording medium rotate faster. As to at least one motor of the motors, the hardware processor switches between and performs a first control to adjust a rotational speed and a second control to adjust a torque, depending on an operating state of the motor.

An image forming apparatus includes an image forming unit configured to form an image on an image carrier, a transfer unit configured to transfer the image from the image carrier to a sheet, a reader configured to read a pattern image on the sheet while conveying the sheet, a sensor configured to measure a measuring image on the image carrier, and a controller configured to control the image forming unit to form the pattern image and the measuring image while forming images on a plurality of sheets, control the reader to read the pattern image, control the sensor to measure the measuring image, and generate an image forming condition based on a result of reading the pattern image by the reader and a result of measuring the measuring image by the sensor.

An image forming apparatus includes: an image forming unit configured to form an image on a recording medium based on an image forming condition, a detection unit configured to detect a test image on the recording medium, a controller configured to: obtain information related to the recording medium on which the test image is formed; determine whether or not to adjust the image forming condition based on the information; control the image forming unit to form the test image on the recording medium; control, in a case where a type of the recording medium on which the test image is formed is a first type, the image forming condition based on a detection result of the test image by the detection unit.

An image forming apparatus includes: an image processor configured to perform image processing to image data based on a conversion condition to output converted image data; an image forming unit configured to form an image based on the converted image data output from the image processor, the image forming unit being controlled based on an image forming condition; a controller configured to perform tone correction control, density evenness control, and total density control that is combined the tone correction control and the density evenness control, wherein, in the tone correction control, the controller operates as follows: control the image forming unit to form a first test image on a sheet; obtain first reading data related to the first test image on the sheet.

An image forming apparatus comprising: an image forming unit configured to form an image on a recording medium based on an image forming condition; an image reader configured to read an image for adjustment of the image forming condition, which is formed on the recording medium; and a controller configured to: control the image forming unit to form images for adjustment; control the image reader to read the images for adjustment; determine a target data based on a reading result of a first image included in reading results of the images for adjustment; and adjust the image forming condition, during execution of a job in which the image forming unit forms a plurality of images on a plurality of recording mediums, based on the target data and a reading result of second image included in the reading results of the images for adjustment.

An image forming apparatus includes: an image forming unit configured to form an image on a sheet based on an image forming condition; an image reader configured to read an image for adjustment of the image forming condition, which is formed on the sheet; and a controller configured to: control, in a case of a job for which printing of the image for adjustment is set, the image forming unit to form the image for adjustment on the sheet, and generate a correction value for the image forming condition based on a reading result of the image for adjustment, which has been obtained by the image reader, to thereby adjust the image forming condition based on the correction value.

An image forming apparatus includes an image forming device and circuitry. The image forming device forms an image on a recording material. The circuitry executes image quality adjustment control for adjusting image quality of the image formed by the image forming device. The circuitry is configured to selectively execute a first control mode for executing first image quality adjustment control and a second control mode including both the first image quality adjustment control and second image quality adjustment control. The circuitry executes only the second image quality adjustment control without executing the first image quality adjustment control in a case in which an execution skip condition for skipping the first image quality adjustment control is satisfied even when an execution condition for executing the second control mode is satisfied.

An information processing apparatus includes at least one processor configured to: acquire physical-property-value information of a recording medium; using information regarding a printing machine, perform an evaluation as to whether there is a possibility that the recording medium causes trouble for printing by the printing machine, the evaluation being performed with respect to at least one printing performance indicator based on the physical-property-value information; and output a result of the evaluation to a display device.