The G7 Method is a printing procedure used for visually accurate color reproduction by putting emphasis on matching grayscale colorimetric measurements between processes.
[1] The G7 method was created by Don Hutcheson, chairman of the IDEAlliance GRACoL (International Digital Enterprise Alliance, General Requirements for Applications in Commercial Offset Lithography) in 2006.
[3] The G7 method's emphasis on grayscale calibration is loosely based around the concept of neutralizing the camera image of a scene using a gray card.
[3] Most printing systems use half-tones to generate images by using a series of cyan, magenta, yellow, and black dots to recreate colors.
[3] IDEAlink Curve Calibration using the G7 method involves comparing two NPDCs from the G7 Fangraph to calculate new aim values that will be given to the printer's RIP files.