IMAGE FORMING APPARATUS

To complete processing of printing a target image including color-coded graph images, while avoiding a situation where a developer container becomes empty in the middle of the processing, even when some of a plurality of types of developer in different colors remain in a small amount.SOLUTION: An area detection unit 84a detects areas of one or more graph images g11 included in a target image g1 subjected to print processing. An alternative color setting unit 8d, when one or more graph pattern colors being the colors of the one or more graph images g11 are colors including a small-amount development color being a development color of developer in which a remaining amount detected by a developer remaining amount sensor is below a predetermined reference amount, sets alternative colors that consist of sufficient-amount development colors being one or more development colors other than the small-amount development color and in which the developer in the sufficient-amount development color remaining in the largest amount is used in the largest amount. A color replacement unit executes color replacement processing of replacing the graph pattern colors with the alternative colors.SELECTED DRAWING: Figure 2 【課題】色の異なる複数種類の現像剤のうちの一部の残量が少ない場合でも、色分けされたグラフ画像を含む対象画像のプリント処理を、途中で現像剤容器が空になることを回避しつつ完了できる。【解決手段】領域検出部８４ａは、プリント処理の対象画像ｇ１に含まれる１つ以上のグラフ画像ｇ１１の領域を検出する。代替色設定部８ｄは、１つ以上の前記グラフ画像ｇ１１の色である１つ以上のグラフパターン色が、現像剤の残量センサーによる検出残量が予め定められた基準量を下回る前記現像剤の現像色である少量現像色を含む色である場合に、前記少量現像色以外の１つ以上の前記現像色である十分量現像色からなり、前記検出残量が最も多い前記十分量現像色の前記現像剤が最も多く使用される代替色を設定する。前記色置換部は、前記グラフパターン色を前記代替色へ置換する色置換処理を実行する。【選択図】図２