Data generating apparatus generating control data for common use in printing processes performed on a plurality of print execution units

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

• acquiring offset information indicating a deviation in a colorant usage used by a specific print execution unit from a standard amount of usage, the specific print execution unit being one of a plurality of print execution units, the standard amount of usage being a standard quantity concerning colorant used by the plurality of print execution units;
• controlling the specific print execution unit to print a first patch image based on first patch image data without using the offset information;
• generating first control data using first read data obtained by optically reading the first patch image, the first control data being for common use in printing processes performed on the plurality of print execution units;
• generating corrected first control data by correcting the first control data using the offset information, the corrected first control data being for use in the specific print execution unit;
• controlling the specific print execution unit to print a second patch image based on second patch image data using the corrected first control data;
• and
• generating second control data using second read data obtained by optically reading the second patch image, the second control data being for common use in the printing processes performed on the plurality of print execution units.

A method comprising:

• acquiring offset information indicating a deviation in a colorant usage used by a specific print execution unit from a standard amount of usage, the specific print execution unit being one of a plurality of print execution units, the standard amount of usage being a standard quantity concerning colorant used by the plurality of print execution units;
• controlling the specific print execution unit to print a first patch image based on first patch image data without using the offset information;
• generating first control data using first read data obtained by optically reading the first patch image, the first control data being for common use in printing processes performed on the plurality of print execution units;
• generating corrected first control data by correcting the first control data using the offset information, the corrected first control data being for use in the specific print execution unit;
• controlling the specific print execution unit to print a second patch image based on second patch image data using the corrected first control data;
• and
• generating second control data using second read data obtained by optically reading the second patch image, the second control data being for common use in the printing processes performed on the plurality of print execution units.