Image processing apparatus, non-transitory computer readable medium storing image processing program, and image processing method

A non-transitory computer readable medium storing an image processing program causing a computer to execute a process comprising:

• specifying, as a pre-processing area, a coordinate area in pre-printing scanned image data obtained by scanning a processing medium on which an image is printed or a pattern is applied in advance and on which print image data according to a print request is not printed, the coordinate area including an image corresponding to the image or the pattern;
• comparing post-printing scanned image data obtained by scanning the processing medium on which the print image data is printed with the print image data, and determining that there is a difference between the post-printing scanned image data and the print image data in a case where a comparison result satisfies a determination condition,
• wherein a determination condition for the pre-processing area is satisfied in response to a difference between pixel values for each corresponding pixel of the post-printing scanned image data and the print image data in the pre-processing area is larger than a first threshold value,
• wherein a determination condition for an area other than the pre-processing area is satisfied in response to a difference between pixel values for each corresponding pixel of the post-printing scanned image data and the print image data in the area other than the pre-processing area is larger than a second threshold value, and
• wherein the first threshold value is larger than the second threshold value.

An image processing method comprising:

• specifying, as a pre-processing area, a coordinate area in pre-printing scanned image data obtained by scanning a processing medium on which an image is printed or a pattern is applied in advance and on which print image data according to a print request is not printed, the coordinate area including an image corresponding to the image or the pattern;
• comparing post-printing scanned image data obtained by scanning the processing medium on which the print image data is printed with the print image data, and determining that there is a difference between the post-printing scanned image data and the print image data in a case where a comparison result satisfies a determination condition,
• wherein a determination condition for the pre-processing area is satisfied in response to a difference between pixel values for each corresponding pixel of the post-printing scanned image data and the print image data in the pre-processing area is larger than a first threshold value,
• wherein a determination condition for an area other than the pre-processing area is satisfied in response to a difference between pixel values for each corresponding pixel of the post-printing scanned image data and the print image data in the area other than the pre-processing area is larger than a second threshold value, and
• wherein the first threshold value is larger than the second threshold value.