IMAGE FORMING APPARATUS AND IMAGE FORMING PROGRAM

To correct a density value of a special color toner or a target value of the density value of the special color toner measured by measuring means that measures the density of an image before being transferred to a sheet, without measuring the density of the special color toner on the sheet.SOLUTION: An image forming apparatus 200 comprises a density sensor 15 that reads the density of an image formed of a chromatic toner before being transferred to a sheet P, acquires a correction amount of the read density value of the chromatic toner in the image sensor 15 or a correction amount of a target value of the density value, by using the density of the image formed with the chromatic toner read by the density sensor 15 and the density of the image formed with the chromatic toner transferred to the sheet P, and corrects the density value of the image formed with the special color toner read by the density sensor 15 or the target value of the density value by using the acquired correction amount.SELECTED DRAWING: Figure 3 【課題】用紙上における特色トナーの濃度を測定することなく、用紙転写前の画像の濃度を測定する測定手段による特色トナーの濃度値又は特色トナーの濃度値の目標値を補正する。【解決手段】画像形成装置２００は、有色トナーで形成された、用紙Ｐに転写される前の画像の濃度を読み取る濃度センサ１５を備え、濃度センサ１５で読み取った有色トナーの画像の濃度と、用紙Ｐに転写された有色トナーの画像の濃度とを用いて、画像センサ１５での読み取った有色トナーの濃度値の補正量、又は当該濃度値の目標値の補正量を取得し、取得した補正量を用いて、濃度センサ１５で読み取った特色トナーで形成された画像の濃度値又は当該濃度値の目標値を補正する。【選択図】図３