An image forming apparatus analyzes image data and detects a first area and a second area in the image data. The first area is an area in which a toner application amount per unit area is greater than a first threshold value and less than a second threshold value, and the second area is an area in which a toner application amount per unit area is greater than a third threshold value that is greater than the second threshold value. The image forming apparatus sets a target fixing temperature for fixing toner to a sheet based on the analyzing of the image data such that the target fixing temperature is set to be higher in a case in which one of the first area and the second area is detected than in a case in which none of the first area and the second area is detected.

An image forming apparatus include a latent image bearer, charger, latent image forming unit, developing unit, receiver unit, transfer unit, information acquisition unit, and correction unit. The charger charges the latent image bearer with a predetermined charging potential. The latent image forming unit forms an electrostatic latent image on the latent image bearer. The developing unit develops the electrostatic latent image to form a toner image. The receiver unit receives the toner image from the talent image bearer. The transfer unit applies a predetermined transfer bias to transfer the toner image to the receiver unit. The information acquisition unit acquires residual image generation determination information. When predetermined residual image generation condition is satisfied, a correction unit corrects image forming condition such that surface potential unevenness of the latent image bearer subsequent to transfer is smaller than that generated where predetermined residual image generation condition is not satisfied.

An image forming apparatus includes an image forming station for forming a toner image on a sheet; a heating member and a pressing roller that form a nip for fixing the toner image on a sheet; a heat absorption roller for absorbing heat by contacting the pressing roller; a moving mechanism for moving the heat absorption roller to and away from the pressing roller; a detector for detecting an abnormal state that heat absorption roller remains contacted the pressing roller; and a controller for controlling an interval between adjacent sheets when image forming operation is continuously carried out for a plurality of sheets, wherein when the detector does not detect the abnormal state, the controller supplies the sheets at a first feeding interval, and, when the detector detects the abnormal state, the controller supplies of the sheets at a second feeding interval longer than the first interval.

A media detection apparatus for detecting moisture information corresponding to a moisture amount or a moisture percentage of a sheet, the media detection apparatus comprising: a light emitter that emits light; a light receiver that receives the light reflected off the sheet or transmitted through the sheet; and a first hardware processor that determines the moisture information on the basis of temperature information corresponding to a temperature of the media detection apparatus and an output of the light receiver.

A sheet heating device includes a heater, a power supply for the heater, and a control unit configured to set an initial power supply level of the power supply at a start of a sheet heating job by the heater based on the sheet heating job and according to whether or not maximum and minimum power supply levels from a last sheet heating job are stored, and control the power supply level of the power supply during the sheet heating job based on a temperature detected by the temperature sensor.

The image forming apparatus of the present embodiment has two limiters composed of a conventional high order limiter and a low order limiter, and carries out control to switch the limiter according to a temperature and a humidity so as not to reach a image contrast potential equal to or greater than those limiters. Carrier development can occur if image formation is performed in a state where the image contrast potential is high. Therefore, by providing a low order limiter as in the present embodiment and carrying out control so as not to exceed the low order limiter at the time of the image formation, an occurrence of the carrier development can be suppressed, and an image density can also be within a prescribed range.

A color printer includes a media transport system arranged to feed print media along a media transport path; a print engine disposed at the media transport path; a controller arranged to calculate an amount of coverage for each pixel and for each process color of an image to be printed on the media, and to control the print engine on the basis of the calculated amount of coverage; a temperature sensor; and a color correction module arranged to determine a correction of the amount of coverage on the basis of a temperature detected by the temperature sensor. The temperature sensor is arranged at the media transport path upstream of the print engine for detecting the temperature of the media as they reach the print engine.

A heating device includes first and second heat generating members, and first and second thermistors. A controller is capable of switching the heating device to a first mode in which the temperature of the first heat generating member is controlled based on the detecting result of the first thermistor and the temperature of the second heat generating member is controlled depending on control of the first heat generating member, and a second mode in which the temperature of the first heat generating member is controlled based on the detecting result of the first thermistor and the temperature of the second heat generating member is independently controlled based on the detecting result of the second thermistor. The controller switches to the first mode during the recording material is passing through a nip portion, and switches to the second mode during the recording material is not passing through the nip portion.

A medium processing apparatus includes a liquid applier and a post-processing device. The liquid applier includes a liquid application member including a foam containable a liquid to apply the liquid to a liquid application region in a part of at least one medium of a bundle of media. The post-processing device performs a given process on a post-processing region in the part of at least one medium having the liquid application region on which the liquid is applied by the liquid applier. The liquid applier applies the liquid to the liquid application region overlapped with at least a part of the post-processing region.

The image forming apparatus of the present embodiment has two limiters composed of a conventional high order limiter and a low order limiter, and carries out control to switch the limiter according to a temperature and a humidity so as not to reach a image contrast potential equal to or greater than those limiters. Carrier development can occur if image formation is performed in a state where the image contrast potential is high. Therefore, by providing a low order limiter as in the present embodiment and carrying out control so as not to exceed the low order limiter at the time of the image formation, an occurrence of the carrier development can be suppressed, and an image density can also be within a prescribed range.