Following options are available in the Curve Preview section of the dialog:

• Show or hide a color channel [1] – enable or disable the checkbox for the respective color channel to show or hide the corresponding curve in the preview.
• Show or hide all color channels [2] – enable or disable this checkbox to show or hide all color channels simultaneously in the Curve Preview.
• Curve Preview [3] – this chart displays the calculated G7 correction curves for each color channel. Changes to the configuration are recalculated automatically, and the curves are updated accordingly in the graphical representation.

To calculate the G7 linearization profile, the following settings are available in the Settings Area of the dialog:

• G7 Calculation Method for Neutral Gray [4] – defines the method used to calculate the gray balance for G7 linearization. The following options are available:
  • Neutral CMY – this method calculates the G7 linearization while taking the native CMY gray balance of the printing system into account. In the darker tone range, the target values for the neutral axis are gradually adjusted from an ideally neutral axis toward the actual a* and b* values of the printing system. This method is particularly suitable for printing systems that cannot produce a neutral CMY black or neutral gray balance at the maximum total area coverage. This applies, for example, to many inkjet systems in which color channel limits are primarily designed to achieve a large color space rather than optimal CMY neutrality. Adapting the linearization to the native characteristics of the system results in more consistent linearization and improved visual gray balance, particularly in darker tone ranges.
  • Grayscale – this method calculates the G7 linearization based on an idealized neutral gray balance. A theoretical neutral axis with constant target values for a* and b* is used, extending from the paper white to the black point of the printing system. This method is recommended for printing systems capable of achieving a highly neutral CMY gray balance. It is also a prerequisite for G7-compliant evaluation in the G7 Grayscale, G7 Targeted, and G7 Colorspace modes.
• Correct outliers [5] – enable this option to automatically detect statistical outliers in the measurement data and take them into account when calculating the G7 correction curves. This option is enabled by default.
• Measurement Data Smoothness [6] – defines the degree to which the measurement data is smoothed before the G7 correction curves are calculated. The following options are available:
  • Without – the measurement data is used without additional smoothing.
  • Low – a low level of smoothing is applied. This is the default setting and provides a good balance between measurement data stability and the preservation of details.
  • Medium – a medium level of smoothing is applied. This setting can be useful when the measurement data exhibits minor fluctuations.
  • Strong – a strong level of smoothing is applied. This setting should only be used when significant fluctuations in the measurement values or unstable measurement conditions are present.

Figure 2: The Create G7 Linearization Profile dialog

If a characterization is to be created exclusively in G7 Colorspace mode, the preceding G7 linearization can be omitted. In this case, when creating the characterization profile, set the White Point Compensation parameter [8] in the Separation Parameters tab [7] to 100%. This ensures that the paper white point of the print substrate is fully taken into account during profile calculation.

Please note that compliance with the requirements of G7 Colorspace must subsequently be verified based on the generated characterization.

Figure 3: The parameters in the Separation Parameter tab of the Create Characterization Profile step