Image processing device, printing apparatus, image processing method, and method of producing printing apparatus

An image processing method of performing an image process on image data representing an image and outputting printing image data to a printing apparatus, the image processing method comprising:

• inputting the image data;
• specifying an ink amount set that is combination of ink amounts of inks used in printing by the printing apparatus on the basis of color information and luster degree information of the input image data;
• and
• outputting the printing image data for printing based on the specified ink amount set to the printing apparatus,
• wherein the image data includes the color information that is information representing a color of an image and the luster degree information that is information representing a degree of luster of the image based on spectrum reflectances at a plurality of angles.

A method of producing a printing apparatus using a look-up table for converting a special luster color represented using special luster into an ink amount set that is combination of a plurality of ink amounts including a special luster ink having special luster, the method comprising:

• acquiring print images of sample ink amount sets formed of a predetermined number of ink amount sets;
• measuring multi-angle spectrum reflectances that are spectrum reflectances at a plurality of angles of the acquired print images;
• generating the look-up table by storing ink amount sets at grid points of the look-up table in which a color of the special luster and a degree of luster of the special luster color are taken on axes, using the measured multi-angle spectrum reflectance and a calculation unit that calculates the color of the special luster color and the degree of luster of the special luster from the multi-angle spectrum reflectance;
• and
• associating the generated look-up table with the printing apparatus.