Image forming system, non-transitory computer readable medium and method

A non-transitory computer readable medium storing a program causing a computer to execute a process comprising:

• acquiring image information about printed material having a predetermined first attribute until a number of pieces of the printed material having the first attribute except for printed material associated with a second attribute that differs from the first attribute reaches a first prescribed number;
• calculating a reference value of the image information about the printed material having the first attribute by using the image information about the printed material having the first attribute that is acquired;
• and
• making image correction of printed material such that image information about printed material having the first attribute subsequent to a first specified printed material and the first specified printed material gets closer to the reference value in a case where the first specified printed material that is printed material having image information out of the reference value and having the first attribute is detected after the number of pieces of the printed material having the first attribute reaches the first prescribed number.

A method comprising:

• acquiring image information about printed material having a predetermined first attribute until a number of pieces of the printed material having the first attribute except for printed material associated with a second attribute that differs from the first attribute reaches a first prescribed number;
• calculating a reference value of the image information about the printed material having the first attribute by using the image information about the printed material having the first attribute that is acquired;
• and
• making image correction of printed material such that image information about printed material having the first attribute subsequent to a first specified printed material and the first specified printed material gets closer to the reference value in a case where the first specified printed material that is printed material having image information out of the reference value and having the first attribute is detected after the number of pieces of the printed material having the first attribute reaches the first prescribed number.