G7® is a calibration method defined by the Print Properties and Colorimetrics Working Group of IDEAlliance. There are a number of firms whose G7® Certified Experts calibrate processes to authorize G7® Master Print Providers, and many of these experts have supported sites running Wasatch SoftRIP. These experts have confirmed that Wasatch SoftRIP provides a powerful and precise platform for printing to G7® or GRACoL® specifications.

Compliance with G7® involves the entire printing process with RIP, printer, paper, and ink. No one component, taken by itself, can be certified. The actual process involves a software package called CHROMiX Curve3, which is available for purchase from www.chromix.com. This software is used to calculate curves that may improve image quality by operating on gray balance. The curves generated by this software are easy to enter into Wasatch SoftRIP's curve editor via the "Enter Curves" menu.

Wasatch does not provide G7® Certified services directly, but this web page provides step-by-step guidelines, based on common practices, that have been described to us by successful G7® Certified Experts. These guidelines describe the application of the curve editing steps to the arriving color space. While some G7® experts have suggested that curve editing be applied to the device colorant space, others have suggested that one or the other is appropriate depending on the particular printing process. In general, there does not seem to be any consensus on how to use G7® in conjunction with ICC color profiles.

Wasatch SoftRIP makes all these options possible, so you can follow the advice of your particular color consultant. For sites that depend on frequent G7® curve editing, we offer a special data import feature at an extra cost, to make that process quicker and more convenient.

Importing G7® Curves into Wasatch SoftRIP

The key is to generate these curves in the correct place relative to Wasatch's ICC-managed color transforms engine. The Curve3 software expects a particular color space, and the ICC engine in Wasatch SoftRIP must be set up to provide this color space first.

The first step is simply to perform Wasatch's normal ICC-based color profiling method, creating a Wasatch Imaging Configuration per our published instructions. A bit of extra care is appropriate for sites that are sensitive enough to be working with the G7® method. For guaranteed success, gamut must be sufficient to cover the GRACoL® input space.

The second step is to replace the default Wasatch ICC input profiles with input profiles that cause our imaging configuration to implement a GRACoL® color space, as shown in the above illustration. Input profiles for this purpose can be downloaded from www.idealliance.org.

When all of this is done, Wasatch SoftRIP is configured via ICC to be in a GRACoL® color space, creating a "virtual" GRACoL® device. All of this is conventional ICC color management.

The Curve3 program can then be used to perform its calibration process. The curves that it creates should be entered into our "Correction Curves" transform. It is important that they are applied to "Correction Curves", and not to "Calibration Curves", so that they are applied to the "virtual" GRACoL® device. As mentioned above, the "Enter Curves" menu selection in SoftRIP's curves editor is well suited to this purpose.

The transparent architecture of SoftRIP's ICC-managed workflow is well suited to this process, and SoftRIP's 16-bit rendering pipeline provides exceptional precision in support of these chained color transforms.

Wasatch SoftRIP is the Color Expert's choice!

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