Image forming apparatus in which editing content for masking, trimming, and the like is set in advance by separate setting unit and image formation is performed in accordance with editing content set by setting unit

An image forming apparatus, comprising:

• means for forming an image on an image carrier under predetermined conditions;
• first storing means for storing data representing the predetermined conditions under which said image forming means is to form an image;
• means, detachably connected to said image forming means, for supporting said first storing means;
• means, attached to said supporting means, for changing the data stored in said first storing means, when said supporting means is detached from said image forming means;
• means for setting conditions under which said image forming means is to form an image and which are represented by the data stored in said first storing means, when said supporting means is attached to the said image forming means;
• means for receiving the data stored in said first storing means;
• second storing means for storing the data received by said data receiving means;
• and
• means for resetting the data stored in said second storing means corresponding to an operation which said supporting means is detached from said image forming means.