Fiery Command WorkStation

Fiery Command WorkStation

Hide or show navigationPrevious topicNext topicSharePrintPDF

G7 calibration workflow

G7 calibration is conducted between the Fiery server calibration and printing of profiling measurement patches.

G7 calibration is applied on the top of the Fiery server calibration. Entering the G7 calibration process, you will select the patch layout for the P2P target you wish to use, measure them, inspect the results, and make adjustments to the settings, if needed.
The G7 specification defines standard grayscale curves that can be used to create a common neutral appearance of output on different printers. G7 calibration adjusts the color output of a printer to the G7 specification, using measurement data from a specific G7 target (P2P target). Fiery Color Profiler Suite supports printing and measuring different P2P targets that are used for G7 calibration. You can measure with any supported measurement instrument.
  1. In the Patch layout window, select the Patch set you want to use:
    • P2P51 (the newer target, a revision of the original)
    • P2P25Xa (the original target)
    • P2P51 Randomized
    • P2P51 Randomized 2up (recommended choice for cut sheet toner presses)
    Note: The actual values used in the targets are similar, but the newer version is a more precise version of the G7 specification.
  2. Click Print and measure the patch page.
  3. Review the G7 gray balance measurement results.

    Because this is the G7 calibration run, it is expected that the results are failing. It is the measurements from this target that will be used to calculate the NPDC curves necessary for G7 calibration.

    The NPDC (Neutral Print Density Curve) is displayed separately for CMY (composite) and K (black). Gray balance is plotted as a*b*. In the table, the weighted average must be less than 1.5 to show as green.  The weighted maximum must be less than 3 to show as green.

  4. (Optional) Click Correction options to display the correction curve, and expose advanced options applied to the formation of the correction curves. You can choose to keep the defaults or change them.
  5. Click OK to print the P2P patch page again with the NPDC curves applied.
  6. Measure the patch pages and view the G7 results.
  7. If the G7 result is passing (all results show in green), click Next. If the result is failing (any result highlighted in red), then click Iterate to repeat the process. It is not uncommon that two or three iterations must be performed to pass G7 compliance.
Parent topic: Create calibration for the server