Image forming system that restrains increase of print data amount, image forming apparatus, and recording medium

A non-transitory computer-readable recording medium storing an image forming program for controlling an image forming apparatus, the recording medium causing the image forming apparatus to function as:

• a print-data generating circuit that generates print data of an image including a plurality of objects, at least a part of the objects overlapping with one another;
• an image generating circuit that generates an image object to indicate a state where the objects are overlapped in the image with a reduced resolution at least partially compared with an actual resolution of the image;
• and
• a boundary color information generating circuit that generates color information of a boundary of the identical object with different shapes in the image and the image object, and
• wherein the print data generating circuit generates the print data including:
• the at least one object included in the image, the image object generated by the image generating circuit, and the color information generated by the boundary color information generating circuit.

An image forming apparatus comprising a rendering circuit to execute rendering of an image based on print data of the image including a plurality of objects to print the image, at least a part of the objects overlapping with one another,

• wherein the print data includes:
• at least one of the plurality of objects included in the image;
• an image object that indicates a state where the objects are overlapped in the image;
• and
• color information of a boundary of the identical object with different shapes in the image and the image object,
• the image object has a reduced resolution at least partially compared with an actual resolution of the image,
• when the rendering circuit processes the image object, the rendering circuit enhances a resolution of a part corresponding to the object in the image object based on a shape of the object overlapped at an upper side in the image object, and
• when the rendering circuit enhances the resolution of the part corresponding to the object in the image object, the rendering circuit decides a color of the boundary based on the color information.

A non-transitory computer-readable recording medium storing a rendering program for controlling an image forming apparatus that prints an image including a plurality of objects, at least a part of the objects overlapping with one another, the rendering program causing the image forming apparatus to function as

• a rendering circuit that executes rendering of the image based on print data of the image,
• wherein the print data includes:
• at least one of the plurality of objects included in the image;
• an image object that indicates a state where the objects are overlapped in the image;
• and
• color information of a boundary of the identical object with different shapes in the image and the image object,
• the image object has a reduced resolution at least partially compared with an actual resolution of the image,
• when the rendering circuit processes the image object, the rendering circuit enhances a resolution of a part corresponding to the object in the image object based on a shape of the object overlapped at an upper side in the image object, and
• when the rendering circuit enhances the resolution of the part corresponding to the object in the image object, the rendering circuit decides a color of the boundary based on the color information.