IMAGE FORMING SYSTEM, IMAGE FORMING APPARATUS, TERMINAL DEVICE, GRADATION CHARACTERISTIC MEASURING METHOD, COMPUTER READABLE MEDIUM STORING PROGRAM AND GRADATION CHARACTERISTIC MEASUREMENT SHEET

摘要

A terminal device includes: a colorimetry unit that performs colorimetry on color values of respective measurement regions on a gradation characteristic measurement sheet where the plural measurement regions are formed in different densities; and a determination unit that determines identification information to identify the gradation characteristic measurement sheet based on a result of colorimetry of identification information measurement regions arranged to identify the gradation characteristic measurement sheet in a result of colorimetry by the colorimetry unit.