Abstract: An image processing device projects a projection image onto a projection plane. Then, the image processing device captures the projection plane. Then, the image processing device specifies a process performed on the projection image. Then, the image processing device changes, based on the specified process, a start trigger of the start of the process or a height threshold of an indicating member included in a captured image from the projection plane, the height threshold indicating a threshold which is used for judgement of a touch operation in which the indicating member comes into contact with the projection image of a release operation in which the indicating member is away from the projection image.

Abstract: A printing method of print data performed by an apparatus, the method includes, providing a first printing mode in which printing including decoding is performed and a second printing mode in which printing without decoding is performed to an output apparatus as options, generating code information by decoding coded information included in the print data when the first printing mode is selected, storing the code information into a storage device, generating a synthesized image based on the code information and the print data, and deleting the code information in the storage device after printing the synthesized image.