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
P2P75+ target, measure it, 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 P2P75+ target. Fiery Color Profiler
Suite supports printing and measuring a P2P75+ target that
is used for G7+ calibration. You can measure with any supported measurement
instrument, including inline measurement instruments, in which case the process can
become automated without user interaction.
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In the Patch layout window, select P2P75+ from
the G7+ patch set list.
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Click Print and measure the patch page.
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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.
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(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.
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Click OK
to print the P2P75+ patch page again with the NPDC curves applied.
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Measure the patch pages and view
the G7+ results.
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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. Additional iterations
will not lead to better results. You can perform a maximum of four
iterations.
