Patent ID: 8582179

Claim:
An image forming apparatus comprising: an image forming section that forms an image on a sheet; a first density sensor that measures the image formed on the sheet and outputs a measured value corresponding to a density of the image; a conversion data storing section that stores plural conversion data showing a relationship between the measured value outputted from the first density sensor and the image density, for each sheet type and each screen for an image; a conversion data selection section that selects at least one conversion data from the plural conversion data stored in the conversion data storing section; a density adjustment section that adjusts a density for an image formed by the image forming section based on a measured value acquired by measuring a prescribed image formed on a sheet and on the conversion data selected by the conversion data selection section; and a conversion data registering section that registers the conversion data on the conversion data storing section; wherein the image forming section forms a prescribed test image on a sheet by designating a sheet type and a screen for the image, then, the first density sensor measures the prescribed test image, and further, a second density sensor measures the prescribed test image, and then the conversion data registering section prepares the conversion data by causing the measured value outputted from the first density sensor to correspond to the density value outputted from the second density sensor.