To appropriately correct uneven density in transfer, and suppress throughput required for creating a gradation correcting table, to increase the precision of an ACC.

At a central part of a chart for measuring a gradation characteristic of a printer, five gradation patches A including a lowest gradation value 0 and a highest gradation value 255 are arranged by selecting from the gradation values 0-255 concerning each color of a CMYBk. For four partial areas obtained by dividing a printing area vertically and horizontally, three gradation patches B selected from the high density side of the five gradation patches A are arranged, respectively.