Image processing apparatus for performing reduction process to reduce amount of specific color material to be used

A non-transitory computer readable storage medium storing a set of program instructions installed on and executed by a computer, the set of program instructions comprising:

• acquiring target image data representing a target image including a plurality of types of objects, the plurality of types of objects including a first type of object having a first attribute, and a second type of object having a second attribute different from the first attribute;
• acquiring remaining amount information regarding a remaining amount of each of a plurality of types of color materials used for printing the target image, the plurality of types of color materials having a first type of color material and a second type of color material different from the first type of color material;
• specifying the first type of object among the plurality of types of objects;
• specifying, as a specific type of color material, one of the first type of color material and a second type of color material, remaining amount of the specific type of color material being smaller than that of remaining one of the first type of color material and the second type of color material;
• determining a first reduction index value, the first reduction index value indicating a first degree of reduction in an amount of the specific type of color material to be used when the first type of object is printed;
• and
• creating processed data by performing a reduction process on the target image data, the reduction process reducing an amount of the specific type of color material to be used in printing the first type of object on the basis of the first reduction index value such that an amount of the specific type of color material to be used when printing the first type of object with performing the reduction process is reduced as compared with an amount of the specific type of color material to be used when printing the first type of object without performing the reduction process, wherein an amount of the specific type of color material to be used in printing the second type of object is not reduced on the basis of the first reduction index value.