Image processing apparatus and image processing method

An image processing apparatus comprising:

• a memory configured to store program instructions;
• a processor that when executing the program instructions implements:
• a post-process instruction unit that provides a post-processing device that executes a creasing process and a folding process with an instruction on a creasing position and a folding position on paper, the creasing position and the folding position being set such that a distance between a position of a fold crease formed by the creasing process and a position of a fold line formed by the folding process is a meaningful distance;
• a reading unit that acquires a read image by reading a first paper in an open state and that has been subjected to the creasing process and the folding process which are executed by the post-processing device in accordance with the creasing position and the folding position;
• an image analysis unit that analyzes the read image to detect two streaks corresponding to the fold crease and the fold line from the read image, and that specifies a position of one of the two streaks as a fold crease position and a position of the other as a fold line position on a basis of the creasing position and the folding position;
• and
• a correction information output unit that generates correction information based on the two detected streaks and comprises information about at least one of the creasing position and the folding position, and outputs the correction information to the post processing device, wherein the post-process instruction unit sets at least one of the creasing position and the folding position based on the correction information such that the fold crease position and the fold line position which are specified match each other when the post processing device executes the creasing process and the folding process on a second paper.