Patent ID: 8908243

Claim:
An image forming apparatus comprising: a conveyance unit configured to convey a recording paper along a conveyance path; an image forming unit configured to form a measurement image on the recording paper by using at least one of color materials; a fixing unit configured to heat the measurement image on the recording paper and fix the measurement image onto the recording paper; a measurement unit configured to measure the measurement image fixed on the recording paper at a downstream position in a conveyance direction of the recording paper relative to the fixing unit in the conveyance path; and a controller configured to control the conveyance unit such that a first time period from a time point that the recording paper passes through the fixing unit to a time point that the measurement unit measures the color of the measurement image in the first measurement mode becomes longer than a second time period from a time point that the recording paper passes through the fixing unit to a time point that the measurement unit measures the density of the measurement image in the second measurement mode.