G7 is a color calibration process that helps commercial printers like The Printery print consistent color with less preparation and less waste. This methodology allows printers who maintain a G7 certification to reliably produce high quality commercial printing that matches from proof to press, and from one G7 press to other G7 presses.
Developed by the IDEAlliance and the GRACoL Committee, G7 is named for its gray scale calibration technique and the 7 ISO ink colors it requires. The “G” refers to calibrating Gray values, while the “7” refers to the seven primary color values: Cyan, Magenta, Yellow, Black (K), Red (M&Y), Green (C&Y) and Blue (C&M). It describes how to use the principles of digital imaging, spectrophotometry, and computer-to-plate (CtP) technologies to achieve these color matches using quality inks and papers.
Essentially, G7 is a set of instructions on the methods for calibrating a press or proofing system based on spectrophotometry (colorimetric data) for gray balance instead of traditional densitometric (dot gain/TVI) methods.
Why gray balance?
Using Lab color, it’s easy to determine gray values: Where the 2 lines cross ( zero a and zero b) is neutral gray. And to measure Lab color, you need a spectrophotometer, which is why G7 methodologies require it – instead of a densitometer.
Look for this seal to determine if your printer is G7-Certified.
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