Processing apparatus and image forming system

A processing apparatus that processes a sheet output from an image forming apparatus including an image forming device that forms an image on a sheet and a heating device that heats the sheet on which the image is formed, the processing apparatus comprising:

• a conveyance device that conveys a sheet;
• a partially heating device that heats a part/parts of the sheet selectively;
• a position acquisition device that acquires a heat position at which said partially heating device heats the sheet;
• a detection device that detects the image on the sheet heated by the heating device, on an upstream side of said partially heating device;
• a distance acquisition device that acquires distance information in the image that is obtained before the heating device heats the sheet, the image being formed on the sheet by the image forming device;
• and
• a controller that corrects the heat position at which said partially heating device heats the sheet, acquired by said position acquisition device, based on a detection result of said detection device and said distance information acquired by the distance acquisition device.