IMAGE FORMATION APPARATUS

To provide an image formation apparatus capable of representing a secondary color obtained by color mixing relatively correctly even if a slight color shift is caused.SOLUTION: An image formation apparatus 1 comprises a photoreceptor 51, an exposure part 40, a first developing unit (developing unit 50M) which contains a developer of a first color, a second developing unit (developing unit 50Y) which contains a developer of a second color higher in luminosity than the first color, and a control part 100, and can use the first developing unit and second developing unit to form developer images of a plurality of colors, including the first color and second color, corresponding to binary images of the plurality of colors, and then transfer the developer images of the plurality of colors, one over another, to a sheet being conveyed. The control part 100 performs, in forming a secondary color image with a developer of the first color and a developer of the second color one over the other, defocusing processing for obtaining after-processing image data by defocusing an image corresponding to the second color and printing processing for transferring the first developer image of the first color and the second developer image based upon after-processing image data, one over the other, to the sheet.SELECTED DRAWING: Figure 1 【課題】多少の色ずれが発生しても、混色してなる二次色を比較的正しく表現することができる画像形成装置を提供する。【解決手段】感光体５１と、露光部４０と、第１色の現像剤を収容する第１現像器（現像器５０Ｍ）と、第１色より明度が高い第２色の現像剤を収容する第２現像器（現像器５０Ｙ）と、制御部１００とを備え、第１現像器および第２現像器を用いて第１色および第２色を含む複数の色の二値画像に対応する複数の色の現像剤像を形成し、搬送されるシートに複数の色の現像剤像を重ねて転写することが可能な画像形成装置１である。制御部１００は、第１色の現像剤と第２色の現像剤を重ねて二次色画像を形成する際に、第２色に対応する画像をぼかして処理後画像データを得るぼかし処理と、第１色の第１現像剤像と、処理後画像データに基づく第２現像剤像とを重ねてシートに転写する印刷処理とを実行する。【選択図】図１