Many print professionals have heard of G7 but are not exactly sure what it is. So, what exactly isG7? G7 is an IDEAlliance registered trademark – “G” for its focus on the color gray and the “7” ink solids specified in ISO 12647-2. It is a gray scale specification AND a calibration method that has roots in offset. The main goal of a production G7 press run is to match an accurate G7 proof. It’s a specification that provides formal colorimetric definitions for neutrality (gray balance) and tonality (darkness, lightness, and contrast of an image). Plus, it is also a calibration method that adjusts gray balance and tonality to meet the G7 specification.