| http://www.w3.org/ns/prov#value | - In order to achieve the above object, another aspect of the present invention is a method of calibrating a printing device by means of a calibrator, comprising: outputting, by the printing device, a patch sheet having a plurality of patch patterns based on different gradation values for each color of color material that is used; receiving, by the calibrator, an instruction to select a device from
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