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 patch layouts for
either P2P25Xa or P2P51, measure them, inspect the results, and make adjustments to the settings.
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 (patch page). Color Profiler Suite supports printing and
measuring P2P25Xa and P2P51 targets that are used for G7 calibration. You can measure with any
supported measurement instrument.
- 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
Note: The actual values used in the targets are
similar, but the newer version is a more precise version of the G7 specification.
-
Click Print and measure the patch page.
-
Review the G7 gray balance measurement results.
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.
-
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.
-
Click OK to print the P2P patch page again with the new correction
curves applied.
-
Measure the patch pages and view the G7 results.
-
Choose from the following:
- Iterate: Repeat the process.
- Accept: Continue the profiling process.
