Image data generation method, structure formation method, structure formation apparatus, and computer-readable storage medium

A structure formation apparatus comprising:

• a processor configured to execute a program to perform operations including:
• preparing first density image data representing a first density image;
• and
• generating third density image data from the first density image data, the third density image data being for printing on a first surface of a print medium including an expansion layer to expand the expansion layer, the first surface being on a side of the print medium where the expansion layer is located, and the expansion layer being configured to expand by heating;
• wherein generating the third density image data comprises converting the first density image data into the third density image data such that, in the third density image data, a density of a first part of a target region is higher than a density of a second part of the target region, the target region being a region having a same pre-conversion density in the first density image.

A non-transitory computer-readable storage medium having a program stored thereon that is executed by a computer of a structure formation apparatus to perform processes comprising:

• preparing first density image data representing a first density image;
• and
• generating third density image data from the first density image data, the third density image data being for printing on a first surface of a print medium including an expansion layer to expand the expansion layer, the first surface being on a side of the print medium where the expansion layer is located, and the expansion layer being configured to expand by heating;
• wherein generating the third density image data comprises converting the first density image data into the third density image data such that, in the third density image data, a density of a first part of a target region is higher than a density of a second part of the target region, the target region being a region having a same pre-conversion density in the first density image.