G7® is both a definition of grayscale appearance and a calibration method. The G7® calibration method uses the G7® definition to gray balance the output colors of the printer. A good gray balance is important because the human eye is very sensitive to subtle changes in grays.
PRISMAsync supports the use of G7® calibration curves created by external tooling. However, PRISMsync also offers a very easy and quick way to create G7® output profiles and calibration curves with feedback about the output profiles and calibration process.
In addition, you can perform a Idealliance® G7® Grayscale test. The feedback of this procedure shows immediately that your printed output meets the G7® standard.
G7® Legacy CMY requires that 300% CMY must be neutral (a* = 0 and b* = 0). This requirement does not always provide optimal gray values when using a printer. Hence, printers use G7® Native CMY to achieve G7® compliance. With G7® Native CMY the target a* and b* values for CMY gray levels are gradually adjusted along a curve that ends at the native a* and b* values of the printer's 300% CMY level.