What's G7?

G7 is an improved method for matching color across multiple devices. The ‘G’ stands for the new calibrating Gray balance and that  the ‘7’ for the ISO core colors CMYK+RGB.


1990s GRACol      Proposal and general specifications
2002  GRACoL6   Guidelines that have become the de facto rule
2006  GRACoL7   Emphasized visual appearance-based proof to print
2007  G7               Proof to Print
          G7 Master   Master or qualification program

Printers who are G7 compliant have to prove that they can match proof, plates and press sheets. The qualification mark means that the printer uses the modern technology based on colorimetry, and employ G7 process controls. G7 Masters bear the IDEAlliance seal of approval. Attaining G7 Master status is a competitive goal for those providing creative, premedia and printing services, worldwide.

Two Conformance Levels
.  Focuses on achieving tight tolerances for gray balance and
   for the neutral print density curve.
.  Uses color management to achieve a color match to an aim
    characterization data set.

Goal
.  To achieve a close “visual match” from proof to press.

References:
http://www.idealliance.org/
http://www.colorwiki.com/